Кто владеет аглицким, растолкуйте убогому рекомендации по решению проблемы:

I replaced the 7b turm with the 7c1. It's was
acctually the same model so I used it instead.

So, in your 7b's unit parts file ( UnitParts12VIIB.upc )
just change the line to this:

ExternalLinkName3D= data/objects/Turm7c_1_hd

that's all there is to it.
http://www.subsim.com/radioroom/show...18#post1027618