It's not like they bolted a generic cargo box onto a pickup and called it good, but I get it.
@AndrewMuse, I know you're pretty new to this forum, so I'll mention that you can change the thread title if you wish. A more accurate title might be
"DIY Ford F-550 Based Expedition Vehicle Project", or something similar. Once F-550 is in the title, it's clear that this isn't going to be a one-off, custom framed & skinned beast, which I could see the current title suggesting. I think that's what
@Shovel was getting at, and he has a point.
I agree that it turned out looking great. I hope it holds up to whatever you throw at it. I'm particularly interested in your power systems, so please continue posting updates.