develop a dynamic drawing using autocad - open to bidding

I am in the glass business and I need a reusable cad drawing that I can pull up on my laptop and enter certain dimensioning that would give me a cut sheet. Currently we use our heads to add up our dimensions, of course there is human error sometimes and this is bad. If we can use a computer to do "add" up our dimensions for a cut sheet that would be fantastic. Lets say we are measuring for a new wall mirror for a bathroom. We just can't measure the length and width and go cut the mirror. We have to assume that all walls and surfaces are not square and level. In order to determine the out of square conditions we throw a laser line vertically and horizontally on the wall. Measuring to these lines from various points gives us the information that we need to cut the mirror correctly. this is where you come in. I will open up a blank template, I think you call this dynamic? I will then enter the measurements (8 of them) in the template and the program will add up and determine the exact sizes and show me out of square conditions. I know this can be accomplished. I don't have the CAD skills to figure it out. I also have attached a hand drawing to better explain what I'm trying to accomplish.