While I understand the urge to rescue this frame, I think it is not worth it. If it came with a fork, may be. You are going to need a specific folding bike fork and steerer post, a specific saddle post that is your case seems smaller than the regular 33mm. Looking at the frame, you will need a wheelset with rear gear hub rather than cheaper cassette/derailleur setup.
Basically, a lot of expenses for an unknown frame when you could start with brand new something such as a Fhon frameset and litepro wheelset (or other) for pretty much (if not cheaper than) what you would have to spend to rescue this frame.

If you had already owned several folding bikes and accumulated a large spare part bin (inc wheelset) than, the rescue subject would be different.