I have to ask - why? The E36 OBC is just slight better than the E30 OBC buy you really don't gain anything but a longer display and a funky looking install.
(As you can tell, I'm not a fan of modding just for the sake of modding 
With that said, I'm looking forward to pics!
You answered yourself.

The E36 OBC IS better than the E30 one. It's got lots of more functions than the E30 one. I've got both, so i know.

I've retrofitted a CheckControl, too. I haven't made it 100% functional (rather like 60% of it works) because i don't have all the sensors from the 6cyl (like the oil one, for ex.) + it's cool, when i get in my car it looks like a spaceship with all the buttons. Ha!