Suppose you COULD fake a Maxim for the motorcycle. If it had no guts, then it would not even be a proper replica, even under our insane laws. Steel box, steel tube for the jacket. That's it, basically. You would need some lathe time for a booster and flash-hider. Spade grips you can make up out of photos.... or find a set of German ones; there are some around. Or get a set of German ones, copy them and then sell 'em.
A guy could do a pretty good job, starting from half a dozen good photos and some basic dimensions.
Look just awesome, too.
On the other hand, the Ural is pretty much derived from the BMW R75M, so you could fake up an MG-34 easy enough. There are even dummy aluminum receivers around for those. And it's NOT a REPLICA. It is a DISPLAY PIECE. People are gonna see the scoot and scream "German Army!! WOW!!!", so you might as well pander to their little minds.
I had a Harley WLC (Canadian-contract 45) and it was black when I got it. That's all I ever heard was, "Wow! A German Army bike!!!!!". People wouldn't even listen if I told them that it was Canadian. After I painted it canary-yellow with black trim.... THEN they would listen, but not until. Great old bike. Actually got it to 103 mph one night, which is pretty much a record with a military-geared 45, but that was after I shaved the heads for 6:1 compression. They were 5:1 factory so they could run on 74-octane gas.
Have fun with the Ural, but think about a Maxim, too.
Stankovy Pulyemet Maksim 1910 goda. That's the beast for a Ural!