I like to consider any idea that involves cheap components and deception of the buyer as a definite bad idea. You'll be risking your investment for something that will potentially disappoint. Plus the build is very likely to end up costing more that you anticipated, with all the tiny parts/details.

A lot of people like to scope out garage sales/estate sales/thrift stores for nice deals, fix them up, and sell them for a nice profit. I'd say that's a little more honest of an approach.