I have a painted WBC outer case for sale. It is a few years old but is in very good condition and has several layers of white paint. Not big knocks or dents, only some minor paint chips. Available to collect from SE London, although I may be able to post it but I expect it would cost 15 or 20...
As chris said it depends on the number of frames you have really. A stainless tank will be fairly expensive, plastic obviously cheaper but not as nice. The winding gear and cage could probably be quite easily bought, but once you've done that it's probably cheaper and easier to have bought one...
8 Frames in a super is easy - just use a standard or heated uncapping knife and they will slip into an extractor without a problem. More honey from less frames = less work for you!