If you are going to use the ADM rings you need to buy
http://www.admaccessories.com/MDS_guidescope_kit.htm
1. the mounting rail is 15mm thick
2. 102mm
3. 112mm
4. 40mm
5. Looks like M8 x 1.25
6. Don't know
7. Dont know
The mounting rail has a v slotted into each side about 3 mm from the top. The rings have a flat machined on the bottom to which the mount clamps attach. At a guess the clamps add about 5 - 10 mm to the height when mounted on the rail. I use the ADM kit with 100mm rings to mount my ZS 66 on a meade LX200 and it works OK. You will also need a 3D balance kit to go with it.
Cheers
Mark