I'm working in HO scale. They offer HO and N (I think, not sure about N), flex track and number 6 turnouts.
Another option would be the CV (
http://www.cvmw.com/cvtswitch/index.htm) turnout kits. They offer full scale templates of their trackwork kits which should provide the dimensions you would need to build the library. Their product range is much larger but they are HO only, as far as I know.
Thanks.
Vernon