Custom Rob English MTB

^^Depends if you're better at wheelies, or no-hands cycling.

That's a great looking rack, why aren't more that shape? makes a lot of sense for tents, sleeping bags, stuff bags, big bars bags, etc.
what kind of load can it take in that set up?

Can't wait to see it all pieced together.

I'm not sure of it's maximum load capability, but it shouldn't be carrying anything excessive for this bike. That's why I didn't want any support struts running down to the legs. I wanted to keep it as clean and slick as possible really.
The shape was one of the main reasons I wanted custom, so it would mate with the bag as smoothly as possible.