AWESOME Woody! Just remember there are no "experts" here and if someone professes to be one they're not!
The only way to do something like what you're doing is to just keep trying new things out, keep experimenting, keep test riding it and
keep trying to break it in all conditions... until you get it right, this is the only way... it takes a lot of time and a lot of energy and money but its seriously worth it in the end.

Strength is the main factor here, don't skimp on cheap welding or cheap materials.
You're welcome to come visit me on my farm in the 7 Passes if ever you're out this way.
All the best with your build!

Cheers. K