It'll work. He said the horse was temp(probably because it slid out while testing). Replace the saw horse with two 2x's from the joint to the base of the platform. That will tighten everything up. Add vertical ones from the joint to the ground if the first pair didn't do it for you. I use screws for everything but have used whatever in the past. It might get a little rickety as you use it and you just add a 2x here or there. You'd shit at the half pipes we used to build in the woods back in the '80s. They'd last maybe 6 months before someone's dick parents would destroy them. We'd hit the construction sites again and do another location. We were in 7th and 8th grade. 3 or 4 sheets of plywood on the tip of our old school ramp boards riding 2 miles, etc. No one ever even questioned us.
Everything you said was legitimate and hilarious. And i get he said the saw horse was temporary but fuck if I can say I would go on this and I know I'm not a contractor or a proffesional when it comes to building things. And it probably wont matter, in the end you'll be like der OUCH! but I'm still advising you build the fucking ramp more stoutley.