Thanks bunches for the info on which files to look in for the missing textures.
I ended up extracting and manually installing everything from disc 2 as none of it was present in the EA game data. Apparently the install manager for disc 2 is corrupt, missing or just not working.
Upon game launch, all went smoothly, trees and textures were in place, CAS generated a sim and all face/hair/clothing were present.
In-game play test:
Don Lothario successfully cleaned his house ( with much moaning and groaning ) to the stereo. No crash when Nina wandered onto his lot and their relationship "progressed".
BodyShop was the next test and it launched flawlessly.
All in all, I'd say my issues have been cured and my sanity saved.... Now I'm gonna burn the carefully placed files to new discs in the correct install order and use the original disc 2 as a frisbee.
Again, thanks for the suggestion of looking in the compressed file on disc, it was the solution.
Update:
Uni will install with no issues, but NL claims The Sims 2 is not installed properly or not at all. I'm assuming I've placed a file in the wrong place and NL, fickle as it is, is reading it as not there. I'm stumbling in the dark as to the exact locations each component belongs in.