I've been looking into building a Warmoth bass and I was wondering if anyone knows how hard it is to build a decent quality one?
It's fairly easy to build one.
I built a jazz a while back with Warmoth neck and Allparts body.
I will pretty much echo what others have said.
-Get the slimmer neck. I wish this had been an option when I bought mine.
-Get the graphite reinforcement rods. The steel rods do the trick but they are heavy!
-Unless you're very good at finish or just want a simple hand-rubbed poly have someone else do the body finish.
I had my brother-in-law do a trans red finish at his auto body shop and I didn't fill the grain properly. Looks great from a distance but up close you can see pin-holes in the finish (where the grain sucked in the finish) and it's clear that if I'd used some stain in a grain filler the grain would look much prettier.
Above all, examine
WHY you are wanting a warmoth. There are other paths we might take...
-If it's to save money, it's technically possible, but you likely won't get exactly the options you want.
-If it's to get a similar, but better quailty instrument than stock I'm unconvinced that it's the way to go. I've seen great Warmoths, but unless they're assembled and tweaked by someone who really knows what they're doing they rarely seem much (if any) better than other similarly priced options. If I wanted to drop 1000+ on a classic Fender style instrument, I'd get a Skyline.
-If it's just to try your hand at instrument assembly, buy a Kiesel/Carvin Kit. Great quality components (better in some ways than Warmoth) and the result will be a consistently lighter and more ergonomic instrument for a much cheaper price. Further, it includes pups, hardware, etc and things like Ebony board, graphite rods, etc are stock!
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-However, if it's to get an instrument that has a combination features that are hard to get elsewhere then Warmoth or other parts suppliers may be a good way to go.
Despite it's minor hortcomings, I love having a Jazz bass with P neck (nearly impossible to find elsewhere) that is in a less common finish (matching trans-cherry red headstock face and body), and that I built myself. I'd do a few things different if doing it again but to be honest, I wanted the Fender headstock and a step up in quality from cheaper aftermarket necks and Warmoth delivers all that.