Re_computer case: metal inserts like the plexiglass ones

Little rectangular inserts made of metal or stiff aluminum that will fit the same space as the plex-glass inserts on the two sides of the re_computer case. This would provide much more flexibility to customize the case and easily allow the user to DIY the case(inserts) with additional jacks, holes, switches, etc. Whatever is needed. Holes could be easily drilled and finished. Maybe a pack of 5 for $10USD?