I mostly do renovations. But am going into guitar making, thus the room. The guitar you see was bought on ebay, it is quite a wreck and I'm going to restore it. Like you I am looking to do work that is less hard on the body and have always wanted to build instruments so i thought if i don't start now I'll never be able to make a living at it. So I'm hoping within 10 years I'll be able to make a living doing it.
Yes there is a bit of deflection but i have yet to put some blocks in the box to alleviate this. I also have to work out the height of the cauls as I'll mostly be clamping guitar plates that will need planning. I expect that this workbench will evolve as i learn the trade and make jigs for it's purpose.
Yes very messy shop. Not that i like it like that, but i get so focused on the job that my shop falls victim to my single mindedness.