Pretdamn near full hollow. There's a block for the pup to screw into and one for the bridge/tail. The sides are about 3/8" thick when the perimeter is routed to final size.
This was mainly going to be a 'proof of concept'. The sides were built from pieces. All my other basses use a standard 14 x 20 blank. I'll draw the perimeter on it and remove everything that's not necessary. This frame took a 4' x 8" wide board and 2-3 hrs to build,probably more. Entire bass weighs
Bridge and neck are modded from an 8 string Rogue. Cataldo tailpiece. I forgot the block under the tailpiece so I through glued front to back 1/2" dowels for each screw. Worked out, no tailpiece tilt.
Bass weighs 7.8 lbs. Top and bottom are from Lowes, I went through a stack of about 25 2'x 4' pieces ($17, void free, thus the faux binding).
Here's some more pix of the build.
Cheap quick connects, pot fits thru the larger triangle. Endpin jack, seems appropriate. Bridge is adjusted for height with shims under it or the neck, none were needed.
I can probably reduce the weight by a quarter pound. Trans white toner top, trans black sides and neck, natural "binding". Three separate tapings.