I was just there last week.
Do they have clean, modern classrooms? Central air in them?
Yes, a large A/C'd classroom opened in July.
Indoor bathrooms/plumbing?
No, still portapotties, but they are cleaned every day.
What other kind of structures do they have.
* A very comprehensive rope & rappel course -- most extensive in the country is complete and courses run on them regularly.
* Large network of underground tunnels for training no / low light, at any time. Complete and frequently used.
* Large expanse of land with set-up outdoor simulators
* 1000 yard precision rifle range.
* Occasionally you can do a shoot scenario from a helicopter w/an M16 (full auto). This is extra and not really a class, but a "fun shoot."
* Phase II's driving track (for survival driving courses) is graded and awaiting asphalt. Curriculum is complete, instructors are being vetted and equipment organized.
Do some or all of the ranges have covered shooting positions?
About 5 are covered out of around 15 or so (that's rough estimate). In a standard 4-day class you probably will shoot at an uncovered range. So go when it's cool!
What kind of shoot or "kill" houses are there?
I've personally been through 4 different shoot houses, though I think there are many more. These are standard simultaed "house" layouts with walls, doors to go through, window cut outs etc. Bad or good guys (photorealistic targets) will pop up and you must engage. I've also been on 4 different "outdoor" simulators in the rifle/shotgun classes.
edited to add: There had been complaints that FS wasn't building up its facilities at all. It is probably more accurate to say they have been building them, but later than was originally stated.
And by the way: you do not have to pick up brass at FS
Do yourself a favor: get a cheap "gray" certificate and go. Even if it's the only time you go to FS you will have had world class firearms training for very little money.