No problem. You can scratchbuild ANYTHING. But some things take more time and effort than others, and some things are worth the effort more than others.
Scratchbuilding this car from styrene sheet will take you many nights, way past X-mas. And you'll need to be one fine scratchbuilder to pull it off.
If 100% likeness is not needed, I'd go out looking for another car type in the right scale. The first version of the VW Golf looks a lot like this car. I think you stand a fair chance of finding that. You make a mold of the car body, cast a resin copy. Than all you have to do is ADAPT the resin body. Mostly the front and the hood will need replacing, I think.
In a worst case scenario, at tleast make sure you have SOMETHING to start with, like the body of a Kübelwagen. That will make your life a lot easier.
BTW: this is a great find ! WIth one of those at the right scale, you have just the setting for any modern conflict in Russia, Kosovo, Bosnia, Afhanistan,... !
Who the hell is General Failure, and why was he reading my hard disk ?
Where's my funky Iraqi general rank that was here on my profile a few years ago? Did they strip my rank, after all I've done for this forum ? Robbery!!