I have 4 U-boats by 3 different manufacturers not on your list. An Engel type 1X (1/45), an OTW type XX111(1/25) and 2 by Sheerline Model Subs. A type V11(1/40) which is to be discontinued and his latest boat which is a type 11D(1/27).These are all fibreglass hull boats and are fully working radio-controlled models. I hope this information may be of interest.