It isn't much more that can be removed from it now.

All the fabricated pieces ready for assembly.

A quick bash with the rivetgun and all the L-profiles are in place.

The U-profiles however are not riveted but glued to the L-profiles using JB Weld. Also the fan mount is attached with JB Weld. The 5-in-3 bay is there to make everything square.

12h later and the JB Weld has set.

If it is good enough to use epoxy to assemble the chassis on a Lotus Elise, it should be good enough for a computer.

The other hot-swap bay has been mounted in the spare expansion slot. As the mini-itx board doesn't have a second PCI slot a small U-profile was added to provide the equivalent support.