Best Bike for First Build

I'd probably stick to the ozark. What's wrong with aluminum frame tho? And what is shoe horning?
Aluminum frames can stress fracture. By that I mean break without warning. After repeated loading, aluminum becomes brittle. Steel can flex indefinitely without too much loss of strength.

Shoe horning is a slang term meaning a tight fit which means custom mounts and off setting the carb. In other words, it just won't bolt on.