[Geek44]

I'm not sure if that specific interior is available Verlinden or otherwise, but that kind of thing can certainly be found as aftermarket kits...I have some Tiger 1 interior kits...there are seperate kits for engine compartments, fighting compartments etc...I think you need three sets for the Tiger 1 but don't quote me on that. I have two...both engine/rear deck area stuff.
I think this one is largely scratch built. I looked at the edges of some of the ammo storage racks and saw the tiniest hint of 'untidiness' that tipped me off. I actually think it's a mix of scratch and kit parts...maybe from various kits. The gun breech looks like kit bits.
You'll have plenty of luck getting interior kits for the popular vehicles. Panthers, Shermans, Tigers, T-34s etc. Good luck trying to find a Matilda or something less 'sexy'.
There's a lot of kit-bashing here. I think I see styrene of at least four colours indicating four kits. Plus scratch-built stuff and aftermarket gear as well.