"Split vertices" in UVMapper did helped when it comes to flat surfaces and straight edges, although some rounded parts look like that poor robot on xantor's screenshot. You say UVMapper Pro does it better ? Sigh. Blender freezes when trying to import given construction. Truespace interface brings back memories - looks strangely familiar. I think I have one of old versions on a magazine CD - somehow I didn't think about it. You say it can render ? Thanks for advices PhilC and xantor. Still no solution but thank you very much for suggestions. Any more ideas, anyone?

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Outdated gallery over at DeviantArt

Fics at FanFiction.net and Archive of Our Own (AO3)