Kiff,

Make a sketch of your system with 4-zone controller and your 4 automatic valves and zone piping with head locations. You will see what your manifold will look like and where it will best fit in the system layout.

Question #3 answered:

http://www.hunterindustries.com/corporate/press_releases/svc400.html

Aloha

That timer goes in a valve box, I think the OP wants one for a hose bib?
Orbit makes one, but each valve operates the same duration and time. One comes on, does it's thing, shuts off and then number 2 comes on and does the same, shuts off and then number 3 and then 4. You can't set each one to do it's own thing.

Here is a link that might be useful: Orbit Timer