I helped my buddy put one together. Aside from having to slot a few holes it fitted up quite nice. One wheel tub had a dent but the return process was easy
800 for the bed would be really heavy in my experience with flatbeds. But to answer question you'll have no issue with 1600 lbs I'd just recommed good shocks. And a trailer hitch (ties rear frame section together)
Showcar body parts in Ontario canada probably can make it but their website is trash so you'll probably have to call. I got a bunch of stuff from them. Import goes flawlessly