1. SInce the track and ties are so low, I would use some sort of roadbed. I use scenic express foam roadbed and love it. 11.99 for 24ft...
http://www.justrains.com/webst...amp;products_id=4312
If you are buying scaletrax and switches, justrains is the cheapest and when you make a large order all at once( $250 or $300) shipping becomes free!
If you are nailing the track down, pre-drill holes in your scaletrax ties. Probably should pre-drill holes even if you screw the track down to prevent the ties from cracking.
2. I don't see why not any ogauge train wouldn't run on it.
3. I like their switches. A few have had some problems. They are much better than the gargraves I have used in the past, almost as good a ross, but much cheaper!
Feel free to e-mail me with any scaletrax questions...although I am new to it, there is a fast learning curve.