I think I saw more bootleg MVS systems in my life rather than the original MVS systems
I know some revisions had up to 4 cartridge slots, but even with multicarts, I'm not sure if you could fit the whole library of 250+ games in just one board

I was filling out a product info sheet, and in the field that very clearly says "Product Name", I wrote down my full name

Same as it ever was, same as it ever was
Same as it ever was, same as it ever was

Making this I realized that I haven't listened to the soundtracks of a lot of Mario games, mostly recent (or at least made in the last decade) ones

That's a tough question, I have a lot of faves...
Maybe Wily 3-4 from Mega Man 3 and Jakob Orbital Elevator from X8
youtu.be/VJPUqbEZrew

I've seen artists use Ko-Fi for commissions, but it's a payment-first service, so it might not be ideal.
Another option I'm aware of is Google Forms, which allows you to set up a survey to ask potential clients for more information before submitting payment.