Hey Gregor, long time lurker on this thread but first time replying! Love the thread and oddly pizza is what made me chime in.
The pellet grill route has a magic trick with a pizza oven insert. We have used this on our Green Mountain grill and it'll get the stone to 700 degrees.
I evidently...
Great looking garage! Got my own 2 car (with a small workshop) that I'll start posting about soon, but getting some great inspiration from garages like yours!