Hey, those look pretty cool. I'll try and answer these questions for you.

1. I am not sure what the polygon limit is, but its very very high. Those models should work just fine.

2. Yes, it is entirely possible to import custom models with different hands or screen positions.

3. The minigun's barrel is animated in code. You can simply remove that code in your weapon mod for the M60

4. Textures for Turok simply need to be .PNG

5. Turok does not use skinned meshes like Half-Life with a skeleton. Instead, models are animated in pieces/segments like an action figure. This should not be a big issue for animating weapons, however. But it would make more complex animations like reloading and bending fingers require more planning.

All in all, everything you want to do is absolutely possible and fairly easy. Make sure you get Blender 2.8+ and the plugins that Behemoth Programmer created

https://behemothprogrammer.github.io/TurokBlender/index.html

I just wondering, I see Snake Plissken replace some weapons models in TDH in his Brutal Turok 0.3c and  I want do it also but have few questions:

1. Is there any limit of polygons in current model? I have many nice models from HL CS 1.6, Condition Zero or from Firearms pack:

sample low poly models from Firearms 2.5 view in (great model viewer lots of format - import and export)

https://richwhitehouse.com/index.php?content=inc_projects.php

Firearms 2.5 models few:



2. Is it posiible to import model with custom hands and change weapon model position in game more left side or more center, closer to screen etc?

3. What about example with minigun model? if I replace minigun by m60 what with rotate animation?

4. Textures - models from HL usually have 4 or more textures, in TDH textures need be all in one?

Any help and tips are welcome