I’m about to start a Dragon King Tiger (Production Turret) in 1/35th scale.
Does anyone know of an aftermarket manufacturer that manufactures periscopes for this and other models?
not sure, but try RJ Products at www.rjproducts.com .They are an aftermarket specialty house and are really good at fielding requests, plus they have a lot of wickedly cool stuff that they make themselves
Fine Molds makes some clear plastic periscopes:
http://www.hlj.com/product/FNMMG-08