thank you divmax, at first i was mad at you cos' I have made a lot of effort to get this model working(and still it didn't work)
So this is what happend whan i was about to prove that testing model cause no problem at all:
1. I took pk3 (zipped 2 folders toghether-
putting it into same zipped file but not into one more folder)
here you can download the file(new md3) and i placed it into base folder in the Trem location
2. Opened trem
3. typed in consol
/devmap transit
4. once it was loaded i typed once more in the consol(in the spec mode)
/testmodel models/buildables/portal/portal
..... and guess what happend? model loaded with all textures
without any skin file!!!
heres a screen:

hope its not just my client

, i guess the secret lies in correctly exported model
Edit: Err sorry

heres the pk3 file i told you i used:
http://files.filefront.com/portalpk3/;10502105;/fileinfo.htmlEdit2: Is anybody out there? ... *echo* ... *silence*
hmmmm, where did everybody go?