I would think a one piece carved out back and side makeup would have to have a very well cured piece to start with, to avoid as much as possible cracks showing up later. But i guess that's important in every build anyway,......just seems even more so here. Too high a moisture content and you're in trouble. A thick piece of wood in starting means a LONG curing time if not kiln dried.
For sure a savings on side bending equipement, body forms while assembling, etc.
.....and it does look mighty comfortable to hold!
I've always liked the way the old bowl backed mandolins were put together, and wondered when someone was going to put together a ukulele with sides assembled from alternating lighter and darker rosewood strips held together by being glued to the liner. (solid liner possibly,....not kerfed for added support?) Maybe someday???
cheers,
Joe T