I'm jumping in here, which will no doubt annoy many. 
I think you're being inconsistent with your use of acronyms.
You wrote: "using a Raspberry Pi/PC, a CRT TV, and a few PCBs".
However, from what I can make out, what you really mean is: "using Mame and ROMS I've downloaded for free."
If you own the original boards, you don't need Mame at all.
Whatever I say here is worth little to nothing. But basically the way I understand it is thus...... Yes, you can use Mame in a commercial box. No, you can't just download a ROM, load it up into Mame, and charge people for playing it. This is because you don't own the game code - the ROM. The two legal ways of doing this are - buy the original PCB, which will likely cost a good deal of money, especially if you want several games; b) You get in touch with the owner of the game code, and get written permission from them (so, for example, you'd have to contact Atari if you wanted to have Tempest on there).
The former is possible, but since this is a money-making scheme, I'm not sure it'd turn a profit due to the initial outlay of hundreds of dollars for the boards. The latter option - going to Atari, for example - I'd say would be swiftly refused.
for whatever it's worth............
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