When I rez a Rez-Faux package, will the build take up only one prim?
No. Rez-Faux is not a “Temp-Rezzer”, which is the kind of device you’re thinking of. These devices cheat the system, taking advantage of the fact that objects marked “Temporary” do not take up your prim alotment. I’ll just take this opportunity to get on my soapbox. These devices for circumventing prim limits are unfair, and allow you to use more simulator resources than you’re entitled to. They cause your build to take up much more in the way of simulator processing time than it would if you’d just rezzed it normally. You may be able to keep more prims on your property, but you’re doing this at the expense of your neighbors. If you hate lag (and who doesn’t?) don’t use these devices! All that said, Rez-Faux can, of course, be used to rez objects that are set “Temporary on Rez”, but that’s probably not what you were looking to do.