Wow, that looks really nice and clean and just epic! Its better quality than the original from Valve
NO
Valve did an excellent job on all their models
This isn't as good as the one I have but it is okay to some degree
To be honest the writing on the clip area saying Edge Gamers should be removed and maybe the logo on the handle but the Edge Gamers on the actual barrel
But thats just my thoughts
Not trying to put you down it is a GOOD model just not something I would use.
If you made all models as Edge Gamers (hey there is a challenge for you) then yes, maybe to make them all fit together like it is meant to.
How do you upload skins? I dont know.
As for your little question it depeds the files you download, but I'll give you the map of where you normally need to put a file..
X:/Program Files/Steam/SteamApps/YOUR USERNAME/Team Fortress 2/TF
When you download you will normally get files called "models" and "materials"
You extract them onto your desktop and then open the file I just put up!
You have to open it so you can actually see the file named TF and not be in it.
Move the window out of the way so you can see your desktop icons called Models and Materials
Drag them ontop of your TF file it will put it in
Sometimes it will ask you to merge files, click "Yes to all"
Then go ingame and see if it worked!