so, I do not personally care for the square shape so much, so I ordered these from -big box hobby store website-.com
Here is a couple of videos, you cannot really hear the 'tom tom' sound they make when you tap on them, but they have a pretty good sound.
I didnt catch it in the video, but they are 1.5" (1 1/2), 1.625" (1 5/8), 1.75" (1 3/4), not very deep. I may buy another set and fasten them together to be twice as thick. I might cut them down, so they are not quite twice as thick, whatever works. I may also get some veneer and cut it to shape and glue it over the bodies I have now. For $10, I think I did ok. It is basically the same as building any other CBG, but I will get a shape I like. These seem to be very similar in size to other cigar boxes available, only not as deep, so I think I will be ok for adapting most plans. There is also a 'boat shaped shelf' and a wooden flower pot, Id like to use as a resonator for an upright bass or 'cello'.
The smallest I think a viola or fiddle, the middle a guitar and the largest maybe a bass, though I think for that, it really needs to be double thick.
I cant do much at the moment to get other parts, but I will probably start tracing over stencils for wood burning, then mix up a stain of some kind to give them some color.
Anyone know where I can get 45 degree corner hardware? I may use some small hinges across the corners, or make something custom.
Anyway, I think these are a fine set of bases to get started with. I'll post again when I have more done or get more parts.