I want to convert my Mezzo I-4 to a sram dual drive 27 speed and have some questions:

1. what wheel should I buy and where to the proper 16 inch wheel in the USA?
2. What about spokes? Where do I get them, and what type/size do I need.
3. Will I need to buy a new chain, or will the current chain fit OK?
4. What modifications, if any, will I have to make to the frame to accommodate fold.
5. What gear inch span will I get (low gear, high gear)
6. What did I forget to ask?

I know bhkyte has made this mod and am hoping he can help me out here.