I can feel for your dilema, as you would need a large machine to handle 6x12cm negs. You are just going to have to move to larger quarters, and buy an enlarger(right after you buy your spouse a really nice ring) an extra bedroom or bathroom would suffice for the new equiptment(and you if you dont buy her something nice)Also, you must do your part in convincing her of the dire necessity of having an enlarger-especially a large one(at least a 4x5)

Rick