My friend was recently given an SMS Model 2 (lucky bastard).

Yes, the system works. It is running Alex Kidd in Miracle World as I write this (the built in game).

Now, I would like to restore the SMS. Cosmetically restore.

When I popped open the console to clean it, I noticed the metal sheet (which I think acts as a ground) on both the top and under the motherboard is rusted nearly completely. I know I can't simply remove the rust and it will look like new. However, I am interested in removing as much as possible and try to put it as close as the day it was purchased. Or at least as best as possible.

Also, he does not have his original SMS Model 2 AC Adapter. He is using a Model 1 Genesis adapter in the meantime. What are the specs for it?

How can I polish the outer plastic casing to remove as many scuff marks as possible?

My intention is to put it in great shape, or close to it.

Any help, and any additional help regarding other maintenance issues, would he appreciated.