Great job on one of my favorite vehicles. Super neat work on the PE and especially the ammo locker. But I've a question on that.
This is my "Hornisse" with Lion Roar's PE built some years ago. The back wall of the ammo locker is shaped differently, it has a "bulge", whilst the Voyager set, as seen in the pics from louisuni, goes straight down. If I were at home I could have a look in my Nuts & Bolts magazine on the Sd. Kfz. 164, but as I'm not home atm, I ask you guys.
No matter what, it's an awesome job so far. Regarding the barrel, I highly recommend ABER #35L-41.
Cheers,
Johannes