I've got a whole load of things I'd like to build myself, when I've got some of the current pile of projects finished!
First up, I've got designs on building myself an 8-string Rickenbacker (already got a lot of the hardware for it) and a LP-style, but through-neck (again, got some of the hardware and wood). For the former, I'm probably going to have to machine myself a bridge but I do have a good MT2 pillar drill with cross-slide vice to do this
Swirling around in the list of other possibles are, in no particular order:
A strat - got an interesting figured bit of ash for a body and a nice birdseye maple fingerboard that would do for this
A 12-string baritone acoustic - I already have one of these but it has some issues I'm still trying to correct, and in the wood stash there's a back and sides of Amazon rosewood and a soundboard blank of red cedar set aside for this.
A tele with a stone body - yes, you heard that right, like any good mad professor I get the urge to do crazy experiments... I have a slab of the fine-grained limestone known as Ashford black marble in the garage and a set of diamond core-cutters, I expect some serious weight relief would be necessary on this one.
A twin-neck guitar/cittern - I got given a gnarly yew stump several years back and the bits I've cut off the outside have been very pretty. Taking a slab across the widest point would give a single-piece body, hopefully with some really great figure. Hoping to get round to cutting later this year and finding out!