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[Virtools] Please test my first N*** project :)

Hello everybody,
 
First, thanx for the great tips so far!
 
I'm currently doing a realtime walkthrough model of our new office complex with N***.
This is my first experience with N*** Creation and I had no time to really learn the tool before I began with the project.  I had to jump right to it, so expect a lot of stupid mistakes.
 
The walthrough is going to be presented on a big cinema screen to about 600 people on tuesday, 20 februari, and I'm kinda starting to panic already.  Me scene still needs a lot of improvements and finetuning.  I also need to add collision detection and some objects in the scene.
 
The most urgent problems, I believe, are maybe the walk script and the number of object in the scene. 
I just want to give a fluent presentation, without any bugs or errors in my scene.
The walkcam is an imported "walk cam.cmo" from François' portal system http://www.translucency.com/francois/
For the number of objects in my scene: I only imported every object once in the scene and made duplicates which use the same mesh objects and materials. 
You will see brick walls in the scene with windows.  Is it better to make the wall with windows one single mesh with one single texture instead of separate objects and loose quality?
 
Here are some problems I experience:
- On a PII 400 Mhz, Matrox G400 Max (32Mb) Videocard, 384 RAM, the walkthrough is starting to get slow (started when I added a lot of chairs and tables).
- On a PIII 500 Mhz, Diamond Viper TNT2 (32Mb) Videocard, 128 RAM, the walkthrough is pretty smooth, but sometimes at specific points the camera just jumps a few steps forward and skips a few frames. 
- I don't know how to configure the script to position the camera at a position I want it to be.
- ...
 
If you encounter any other problems, mistakes in my scene, please let me know. 
Any tips on how to further optimise my scene are more than welcome!
Should I buy a GeForce2 ???  Will additional RAM help?  Maybe a dual processor?
Hey, I'll even send you the cmo source file if you want (it's 702 KB for now) if you want to have a go at it.
If you need additional information, just let me know.
 
Finally, here's the URL for the test: http://www.eds.be/Mechelen.html
 
Many thankx for reviewing my project and sorry for the long mail.
I'll put all the contributors in the credits list ;)