Mate im trying to think of a nice way to display some cards of mine aswell. I was thinking make a frame then maybe if you use like a thick foam base maybe 10mm and cut out your slots then cover the lot in a nice black fabric. Fit the cards (In their magnetic holders) in the slots then posibly use a UV protective perspex for the face then just dress the edges with a nice looking framing timber and have the whole thing painted gloss black.
Yeah i want something similar, im sick of havin mine jus in my draw. There was one bloke making them awhile again but i cant for the life of me remember who it was, havta do some searching i think