I'll take a whack at your questions:
1. I found these end caps to work best, I used 90* silicone couplers to help cram it in behind the bumper. Otherwise it would have required running piping through the lower fender area and I wanted to keep the intake volume to a minimum.
http://www.werbatfik.com/uplimg/fmic/fmic1.jpgI dont recall off the top of my head what size the fmic but I can find out if you need it.
2. You'll be able to run 16psi of boost on the stock turbo without burning it up. Anything more is overspooling and it still generates a substantial amount of heat at 16psi. You will need fuel upgrades to run any more than 10psi though or you will run the risk of melting pistons. A larger exhaust (especially a turbo-back) will tend to generate massive boost creep and spiking...so try to coordinate your fuel upgrades along with your exhaust.
3. There is a very nice hybrid turbo that can be made for the capri using the hotside and center section from a stock turbo and the compressor from a Ford Probe/MX6 turbo. Its called a VJ14/VJ11 hybrid. It flows some 30%+ more than stock and it will spool quicker, all while holding 16psi to redline (the stock turbo will have a hard time doing that). 16psi is a good number to stick with, even with that particular hybrid any more will be sticking it past its efficiency range.
4.Your stock injectors will do fine for the time being. They're around 320cc. You could expect 180-230hp with a turbo upgrade...I've seen people making 190hp on a stock turbo before though.
Also, find a strutbar...and find some wider wheels and throw some sticky tires on them. You'll need it.
-Rocketman