This is Hobby Boss's rendition of a paper panzer that was a proposal to create a combined, simplified version of the Pz.Kpfw. III and IV. I finished mine as a prototype with the hull still in primer and various components from subcontractors pre-painted with dark yellow. For the turret, I painted it as if it was salvaged from a damaged Panzer IV. The kit didn't come with a turret bin, so I added some damaged brackets for the missing bin.
This is partial text from the full article (usually with photos) at https://armorama.com/list/hobby-boss-pz-kpfw--iii-iv-auf-einheitsfahrgestall