I would like to find someone, on the site, to make me something. Do I ask in the Marketplace or MPSIMS?
I believe we’ve had posts like that in the Marketplace before; that would seem the logical place for it. But I have been wrong once or twice so I would hold off until someone close to a TPTB chimes in.
The Marketplace is a good spot for it.
After you have a marketplace post, you can add a link to it with a short description in your signature for a little extra free advertising in your other posts.