I wouldn't use an MV-1C, because the cart sticks straight out the top and it would be insane to relocate that double-connector slot. An MV-1B is pretty small and the cart is horizontal.
Well, with that many conectors, the cartridge isn't going anywhere. I suppose if you wanted a handheld you could go that route, but the MVS is the wrong unit to be converting to a handheld. Laptop would be more appropriate, because then you could also have a real joystick, which IMO is absolutely critical to playing 99% of the games available for the MVS
A thought with the MV-1B: yes, they are small, but very thick. You'll have to make doubly sure it's not got the Irritating Maze bios onboard, and you'll have to contend with the fact that of all Neo Geo MVS board, the MV-1B is probably one of the hardest to find, most expensive for single slots, and most difficult to repair if anything goes wrong. It's got a very high custom-IC count, none of which can be found anywhere but on MV-1B boards, and one of which, a sound processing chip, tends to go bad on a regular basis.
And yes, a laptop with built-in arcade style controls would be awesome.http://cgi.ebay.com/MVS-Neo-Geo-1-slot- ... 286.c0.m14http://cgi.ebay.com/MVS-Neo-Geo-1-slot- ... 286.c0.m14http://cgi.ebay.com/Neo-Geo-MV-1FZ-SIng ... 286.c0.m14
And again yes, I would LOVE to consolize an MVS, but I can't find a board cheap.
Cheap as they come!