You have a lot of design challenges to overcome, and really need an integrated approach, IMHO. If I were in this situation, I would do one of the following
- Post in the cnczone section for RFQ / jobs
http://www.cnczone.com/forums/employment_opportunity/
- Post in craigslist or similar jobs / gigs wanted kind of forum.
A project this large needs a real designer / engineer for the project. There are a lot of good, under employed people out there, you should have no problem finding some. Depending on your area, 5 - 20% of the US is unemployed, so getting a consultant should be no problem.
Just a general question though - Do you have an idea on how to use one motor to pan and tilt ? I assume some kind of gearbox ?