Simple Modular HDD Caddy

A remix to fix a few issues I had and simplify the model.
works great, all my normal screws now sit deep enough to grab the thread nicely.

Added sunken holes for screw heads as I couldn't use the normal hdd screws with the original model.
Filled in some (imho) useless holes that were contributing to the model warping.
Fixed h-pegs to model, added slight angle to start of the groove.
Cut angle on top of h-pegs to make for easier connecting.

v3: deepened grooves on bottom slots for hpegs to make for a easier but still snug fit.
Added supports for hpegs to allow building without support (testing now).