Blender 2.8 dosen't support my lovely Windows XP SP3

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

I uploaded it to my personal channel by mistake but still you can watch it:

Ok can you message me the model to download?? i will make an example for you if you do

In rar OBJ file and texture:

https://drive.google.com/open?id=1BVyd4MGqeMFbFiwKx-bbO3uNvMdKSAGa

In 3ds grass look this:



Texture can be change any time:



And Jay I want replace plant15 by my grass. I mean if in editor I choose plant 15 I want see my grass in model view window

I want replace example plant15 with this low poly grass model:

https://img1.cgtrader.com/items/205145/bbdef8f6cf/large/realistic-grass-1-3d-model-low-poly-fbx.jpg