I’m not sure about the panzer chassis, but they might have been mounted on a Tiger. At least I think so, not to sure where I heard it though. So I may be completley wrong. Sorry, I couldn’t have been more of a help.
Yes it did happen, with one vehicle, can’t find the photo at the moment. I believe it was captured when Berlin fell and was a makeshift arrangement, not something that was ever designed or produced as a variant.
yea i’ve never seen that chassis in the pic before. i wonder if it were one of them prototype chassis like the special vk one used for something like sturer emil. the text mentions the earlier prototypes based on a Pz Sf IVc chassis. never seen that either…
Michael Rinaldi also built a panzer IV mit 88mm last year and posted the build on the Missing Lynz Construcutve Comments page. Here’s a link to the finished product; looks pretty nice. Guy does excellent work.