Bespoke Builds
A swimming-pool route — one continuous cavity spanning every pickup position instead of individually shaped pockets — is what turns a stock guitar body into a blank canvas: once the wood no longer dictates pickup placement, the pickguard does. This chapter covers routing a swimming-pool cavity safely, wiring independent per-pickup switching to take advantage of it, and the build order that avoids redoing finished work.
Everything else in this book works within a guitar’s existing pickup positions. A bespoke build removes that constraint outright: instead of individually shaped pickup pockets, a swimming-pool route is one continuous cavity spanning the full area from neck to bridge position, deep and wide enough that any pickup configuration — three humbuckers, a mismatched trio, whatever the design calls for — can be mounted through a custom pickguard rather than through wood that was routed for a specific factory layout. Once the cavity stops dictating pickup placement, the pickguard becomes the thing that actually decides where pickups sit.
Routing a swimming pool: precision comes from the template, not the router hand
A swimming-pool cavity is cut using a template — MDF or acrylic, cut to the exact outline the cavity needs — clamped or taped to the body, with a flush-trim router bit riding the template’s edge rather than being guided freehand. The template has to be laid out against the pickguard’s actual footprint first (trace the pickguard’s outline and pickup cutouts onto the body with it taped in place) so the finished cavity stays entirely inside what the pickguard will cover. Depth comes in passes — roughly 5mm per pass rather than one deep plunge — because a shallower cut per pass dramatically reduces tearout and the chance of the bit grabbing unpredictably in end-grain-heavy areas.
This is genuinely dangerous work if rushed: the body has to be clamped securely enough that it cannot shift or be flung by the router, the bit needs to reach full speed before it touches the wood, hands stay clear of the bit’s travel path at all times, and a chipped or dull bit gets replaced rather than pushed through one more cut. Router dust from a finished guitar body can carry genuinely toxic material — lead in some vintage finishes, isocyanates in polyurethane — which is a real reason for a dust mask and vacuum extraction, not a formality. None of this is optional caution layered on top of the “real” instructions; it is the instructions, and skipping it is how a swimming-pool route turns into an emergency room visit instead of a guitar mod.
Independent per-pickup switching is what a swimming pool is actually for
Once three pickups can be mounted wherever the pickguard puts them, the switching scheme that makes the most of that flexibility is independent on/off per pickup — the same SPST-per-pickup approach covered in Switching Systems, feeding a shared output node ahead of a master volume and tone control. This is the specific advantage a swimming-pool build has over any factory guitar: with three independent switches, every combination of pickups is available — any single pickup, any pair (including bridge+neck, which no Strat 5-way or Les Paul 3-way switch can reach on its own), or all three together — a total of seven usable combinations from three pickups instead of the handful a standard selector switch permits.
The pickguard is the actual design document
Because the cavity itself no longer constrains pickup position, the pickguard is where a bespoke build’s layout actually gets decided — and that means fabricating one is as central to the project as the routing itself. A pre-cut pickguard for a documented non-standard layout (searching secondhand marketplaces for the specific configuration is often faster than fabricating from scratch) is the lowest-effort path when one exists. Modifying a blank pickguard by tracing and cutting new pickup and switch holes works well for a layout close to an existing standard shape. Fabricating one entirely from scratch — tracing the old pickguard for the outer shape, cutting pickup holes with a router and template bit or careful freehand rotary tool work, using the original as a drill guide for mounting screw holes — is the most work but the only option for a genuinely nonstandard shape.
The build order that avoids redoing finished work
A swimming-pool build has a lot of steps that will ruin each other if done out of sequence: acquire every part before starting (a backordered switch stalls the whole project at an awkward point otherwise), route the cavity before any wiring exists (routing dust gets everywhere, and exposed electronics don’t survive it well), fabricate and test-fit the pickguard next, then wire the entire harness off the guitar on the bench — testing continuity and function before it’s anywhere near the cavity, the same off-guitar-first approach covered in Wiring Diagrams and Signal Flow — then shield the cavity (see Grounding and Shielding), install the tested harness, install and set up the bridge last, and only then do a full functional test across every switch combination.
Common mistake: designing the switching scheme after the pickguard is already cut
Committing to a pickguard’s pickup and switch cutout positions before deciding exactly how the switching will work — how many switches, where they sit relative to their pickups, whether a push-pull pot needs a hole or reuses an existing one — routinely forces awkward compromises once the wiring plan is finalized and the plastic is already cut. Answer the switching design questions first — how many pickups, independent switches or a selector, master or per-pickup controls, any series/parallel or coil-split additions — and draft the full wiring diagram before a single pickguard hole gets cut, not after.