Before you buy the metal kit, I’d recommend looking at the Flak 37 with transport option, if you don’t like working with metal models. It’s the plastic kit which still works for Blitzkrieg, includes a transport, and the kit I received also included lumbers. It’s a good option since you’ll have to get a sdkfz. 7 anyways if you want to move the gun anywhere in game.
For basing, an alternative that I did is to not even base the gun. The gun has a large enough platform that it can easily be its own base and on the plus side if you keep the crew based separate you can easily use the gun as an objective or terrain piece.
Also, if you haven’t already, buy magnets if you want the turret to rotate. The gun is slightly top heavy and won’t stand properly without the turret unglued, but it’s worth it to allow the gun to traverse and elevate!
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