The standard wood recipe for a hollow body jazz guitar seems to be maple sides, carved maple back with a carved (and braced) spruce top. It's not uncommon to find some with maple tops. The model at resurrection guitars has a koa top and back with mahogany sides. In my mind, I'm imagining this to be all flame maple, possibly finished with a nice antique violin burst. As an alternative I could imagine this same small-body hollow guitar with vermilion sides and cocobolo top and back - with these woods, I'd want a clear finish.
Mike - I agree with you, I think the Skylark is an outstanding platform for a hollow-body guitar - I believe the body size, as it is, may even be large enough for the top to resonate sufficiently. The controls may need to be rearranged to accommodate for f-holes, and it might be cool to add a nicely carved matching pickguard. The Skylark's dual HG4 pickups would be a nice match for this kind of guitar, as well. In addition, I have a few ideas for fretboard scroll inlays, and an inlay in the ebony tailpiece.
Valentino - can I assume from your post that this project is something that Alembic would consider building if an order were placed? If so, I might have to reconsider the purchase of an acoustic guitar I've had my eyes on - a Santa Cruz, Tony Rice model - and re-channel those funds toward a hollow-body Alembic jazz box.
Tom