A single camera view from a fixed location covering a 200x200' area is a tough call. This is especially true when the area is going to change daily with equipment and structures. You did not state the purpose of the camera (s).
Theft / damage prevention by contractors, workmans comp required, time-lapse coverage of the site, quality control.
After Hours theft prevention - exactly how does recording a theft prevent the theft?
Enabling some bright lights, alarms, etc.... or simply having forensic video...
Does a talk-down PA have value in this situation?
Many construction sites with high value equipment are required to have fencing, (chain rattle alerts) Even larger projects may have guards drive by on occasion..
If the client can't monetize the need/value of not having usable video coverage, you'll simply trying to find a low cost product to sell. And when it fails to provide unusable video, you'll be the blame.