Hello, Pawel, and thanks! Yeah, the cab is not quite the right shape but heck, neither am I! lol. I'll round those fenders off some more.
You're right - 3D printing, at least for the cab, is the way to go, although... can it be done without making the insides solid? That would be a lot of work to carve out the insides if you wanted to detail the interior or add windows.
So if you had a 3D printed cab and the chassis and wheel sets from an Academy M35 kit (or equivalant), that would take care of the hardest portions of the model. The chassis has to be extended in two places, but that's easy.
For the tank, I used a plastic 1 1/2" diameter sink tail piece that you can pick up at a hardware store, so that was pretty easy to make. The pump house is pretty straight forward and a good way to use up some scrap pieces of styrene.
I only had two or three photos of the actual fuel truck that I could use for measurements and those were mostly at angles. And wouldn't you know it - after most of the truck was finished, I came across a website that had a full walkaround of the truck. Augh! This has happened to me many times before.
If you or anyone else is interested in doing one of these trucks, let me know. I'll be happy to help in any way I can.
Thanks for the help, Pawel and best of luck to you too, my friend.
Russ