hey, I'm not here to charge You, not at all))
just the opposite, I'm very glad to use Your T4 tram in game and am waiting the final version! I like T4 trams, I've ridden them in Dresden (both modified and original, museum one) and Leipzid (blue-yellow modified cars). I loved Dresden museum ride so much so I've bought an H0 model of it (see the pic, it is elfenbein-rot pair T4+B4).
Actually, now I'm working on tatra T6B5 tram. It has the same Scharfenber-coupling wich german Tatras has, so, when it ready, I have plans to make T3D+B3 tram pair (it would be T3 tram with Sharf-coupling and cabin-less second car) and would be glad to post it both in Your and our site, if it is possible. I think I would have no time to mod it into modern modified Tatras due to the release of Cities Skylines game, wich I'm also modding now, so i could just publish my model in obj or 3ds formats for your moders to work on it
About ugly modified tatras, there are a bunch of Schwerin-modified T3Ds in russian city of Tula. Earlier we had some used german T4 and T3 cars in Voronezh (I used to live there, alas, there no more tramlines in the city), Lipeck, Ufa and some other cities. so we (russians, I mean) are quite used to german cars))
p.s. about the blueprint, Your one is quite right, as I can see... I should look at You tram in game, think, I would be able to do it today.