Originally Posted by Pirates55
This is a sketch of what I want to build but I'm afraid the weight will be over 400lbs. I'm getting pricing on aluminum tubing now to lower the weight.
Ok, lets see. It appears that it is 1 ft longer on the top then the bottom, correct? Yet the picture of the sample structure would be narrower at the top given the sloped in walls shown.
If your going to proceed with a solid door, you will need a structurally sound hinge and anchor point to attach it. I'd agree with the other suggestion and build a slider from door track acquired either from tractor supply or the like. With that system however, your going to have to build a frame to receive and support the door, for the entire throw of the door, which looks to be 24 +ft. Thats a good size rail to support.
If you want the least headache wise, square up your opening first, then build your door, making sure it is square as well. Go to a metal roof supplier and have them cut you the lengths you need. If you try and go out of square, your in for headaches you can't even begin to comprehend. One more suggestion, you could frame it in 2x , do 2x cross bracing so it doesn't rack on you, then screw the metal to the frame. Keep the frame in square at least until you get the first couple panels on. The metal comes in 3ft (approx.) width.