Cabinet Mounted Filament Spool Holder

I made a custom enclosure for my RepRap i3 and needed a spool holder that would work with it. It should work well with just about any cabinet/enclosure, just needs a few holes cut.
There are several pieces to assemble:
1. end caps that work with spools that have a 48mm hole, like the SainSmart spools
2. the main mount plate
3. the top support hooks
4. the rod backing piece
The two end caps are designed to have a 608ZZ bearing pressed in and to be slid on to either 8mm smooth rod (wha