I'm beginning my researches because I think I'm going to try a first "home made" conversion. The 251 / 22 is the version equipped with a pak40 75mm cannon. Does anyone have pictures, mainly of the interior ?
Though not photos, there are colour plates in the Osprey Vanguard book on the 251 series. My copy is #32 from the original versions (I presume the New Vanguard #25 has the same plates).