Sheesh, I'm going out on a limb and guessing anyone with that knowledge and fab skills knows that it's not going to chug down the road with the AC, seat heaters, exhaust brake and Nav on like you're sitting in your living room!
Reading into what I know about your component selection, it will tow and stop 10klbs just fine. Also assuming you're not building this to go x country full timing in, but rather to be the only guy pulling up to the local campground with a 60 year old truck hauling a new TT!
My 4 concerns would be comfort, it'll be a cramped old truck no matter how you outfit it.
Ground clearance and traction.
And lastly the weight of the rig itself. Pretty lightweight truck for towing something that size by today's standards.
BUT I can't wait to see pics! Ultimate cool project!