The one and only book to get (I have a copy if you would like to borrow it):
http://www.globaldialog.com/~obsessiontscp/Book.html
If you are have trouble finding good quality ply sheets, I can help.
I also have a 16" mirror cell and some other bits for sale (see the sale/trade forum).
There are a couple of online how-to pages that cover the construction process of the Telekit already:
http://www.waningmoonii.com/Astrosystems%20Telekits.htm
http://mpgf.net/buildit.htm
If size is a concern I would not recommend the Telekit (I could fit an 18" mirror in my 16" Telekit mirror box if I used a Kriege/Berry style mirror cell).
Also had another couple of setbacks, the lower truss blocks are not square and I'm waiting for another set to be shipped out, and the azimuth brake is too short (I've made it higher with an additional furniture pad on the underside).
Apparently Astrosystems have had to fire one of their junior staff who was responsible for making these and many more mistakes.