Hello!
First, I need to make sure I completely understand what you want. As I understand, you need a script that will let you specify a position where the camera would be, and a gameobject which the camera will look at. If so , I could deliver that for you in 1 day, since that not at all complicated I'm sure you will have no problem understand my scripts.
Also, having watched the KGFCameraSystem asset, if that what you finally want, I confident that I can help you complete all the phases of your project. In case you need more than that, I believe that with more than 3 years of experience working with Unity I can still help you since architectural visualisation was never a hard topic for the programmer, but more for the artist.
The reason my price is lower compare to other bidder is that I still a student, I need to create a portfolio for my future work, and I may finish the project slower than others freelancer since I have to spend part of my time for school, but I can assure you for this project I can finish it in just one day.
Contact me if you need anything.