In my scrap box I found a Revell 1/48 White truck cab and I set it on my workbench to contemplate for a while. And last night I took it to the bi-weekly Build 'n' Bull and made a pretty good start.
Here are the component parts as they stood this morning:

And mocked up into a vehicle:

It'll have two NEV-1 tanks on each side, probably with rocket engines affixed to their aft ends, and little scrawny chicken-leg landing gear. The "chassis" piece, which is just a styrene box, will get more rounding of its corners to make it match the feel of the White cab better.
The cargo hold was made by wrapping corrugated sheet around a couple bulkheads; I wanted to get a Citroen 2CV van feel to this part:










