Nice work on it. however, there are a few issues. one of them being that if you put weight in the bed, the bed starts to wobble on the frame. another one being that when its in 4wd, the truck shakes hard.
things to improve:
maybe make the hood flow a bit more into the cab
perhaps make the bed a bit lower to the wheels to give it sort of a chevy kodiak 4x4 look
rear bumpers for the bed?
integration of the powerstroke/duramax engine mod?
The first request is the ability to use different upfits other than the pickup bed and the fifth wheel. The second one, which is a huge need for the standard frame parts options, the ability to have either a second tank or a tool box to fill in that gap. The third is about the pickup bed, specifically the area around the wheel, I would to see a bed option that the wheel well lowered a tad bit, like this image https://www.alainclass.com/wp-content/uploads/2019/03/5-FORD-F650-SUPER-31073.jpg . Out side of those, this is perfect!
Looks perfect except the bed and the cab look off to me but thats how they look irl . i cant complain i could never do anything like this. great job and this is a truck that ive wanted for a while. keep up the good work!