sspanzer:
Two books that would really help you in this are
1. MODEL BUILDINGS MASTERCLASS - Roy Porter (Excellent Book, lots of reference and varied subjects of structures)
2. Architectural Modelling in 4mm Scale - Author Unknown - (Great book, lots of reference and how-to information, details of various means and methods of construction, everything from tools to use to materials)
If you can locate a copy of either of these I know most of your questions will be answered.
Cheers;
Gregory