It is very easy.
First you need to make a normal map for the texture...
If it's a segment your going to have to add an extra line in the the segment file to be able to use the normal map.
Then you have the problems of the outside wall being higher than the inside wall that also needs to be edited in the segment file.
Some of the entity files are so screwed up your going to have to redo do them completely or just use some thing like wethams entity maker to remake the whole entity texture normal map and all...
Then you got the problem on some entities not scalling correctly that needs to be fixed...
Then you got the problem of textures not displaying correctly or isn't correctly mapped and has to be remapped...
Once you have done that to all 2 billion files in the add-on packs let me know...???
Pointless Assault video
http://w13.easy-share.com/1408971.html