Dude I still like this but videos asap. The ramp is gonna fuckin' bust.
Ummm yeah... The first time you weight that second section it will buckle the leverage will push the saw horse out. You need a fixed leg support, have a few ideas. Cudos for the work so far.
disclaimer: I've build everything from garages to skyscrapers over the past 25 years, never a SB ramp, so my insight is totally speculative