You can always try and look for some old frames and piece one together yourself. I built one with little to no knowledge about mechanics/metal working. I found pretty much everything I needed instruction-wise on the internet. Email me if you need help and feel like you want to build.
gnarshredd6@gmail.com It is nice to buy from a company though if you can since they usually have support/warrantys of some kind. Everyone's advice in this thread is good so far. Pulldozer and Yankmeister winches are both pretty solid. Yankmeister uses a pretty big engine if you want to deep-water start heavy people.