Hello. I'm still pretty new with building and using/modifying scripts, etc., so please excuse any simple mistakes or ignorance.
I've built a holodeck and some scenes from scratch using the info and scripts from this SL wiki page...http://wiki.secondlife.com/wiki/Open_Source_Holodeck.
I've used the info and scripts exactly as is, with the exception of building a 20x20x20 shell (instead of 20x20x10), changing the texture NC's as necessary, and I didn't use the door script (as I planned to use a combo of my own doors and phantom prims). Once I got the hang of it, it's working nicely..