I haven't been following this thread since day one, so I'm jumping in kinda late. But let me reassure CenterFreq that he is NOT trying to do something impossible. About 2 years ago, I had no idea what FTA was, let alone own a system. I had no nearby friends who were into this hobby, and no local dealer. I relied 100% on info obtained through boards such as this.
After reading for 6 months, I decided to take the plunge, and in the Spring of '07, I started purchasing hardware. Viewsat Ultra, 76cm Winegard, QPH031, and against the advice of others telling me not to start with a motorized system... an SG2100.
From the very start, I installed it, motor and all, on a rooftop over a screened in porch. My initial challenge was to mount the vertical post. I knew enough from my reading that I wanted this post to be perfectly vertical, and extremely rigid. There were some challenges to do this because of my roof and an additional overhang. But once I got past this, it was easy sailing from there.
Once the dish was physically mounted and ready to be pointed, I was able to find my first sat in under 15 minutes. If you are attempting to aim your dish and you are not using one of those $10 sat finder boxes that mount in-line at the dish and produce signal tones, you are crazy.
With another 3 hours of my time and about 8 trips to the roof top, I was able to get everything aligned to the proper arc, picking up sats from 72W to 129W, and many in between.
I'll admit that I was having some issues getting the USALS motor functions to operate correctly so I temporarily started using the manual user setting that Viewsat has to store the sat locations. It worked well, and gave me no problems, so I never really went back and implemented the USALS.
A year and a half later, the system is operating great. We still have our cable subscription, but the FTA receiver gets regular use as well.
Bottom line: I started out with no previous knowledge, had only my 14 year old son to assist, and installed a motorized system similar to yours. IT CAN BE DONE!!