I am about to start building a roof rack for my 80 and was wondering if there is a specific dimension that I should try and build it to or should I just get a tape measure and go for it? I want to build it full length and open up over the sunroof. I have the design in mind just needed some info on getting started. Also, where is the cheapest place to buy the gutter mounts? I see people talking about getting them cheap but nobody says where. Thanks