My father did the following:
Boards
Take large boards as high as you want, and about 4 feet wide.
Make a "frame" of 2x4's around it. You put the "2" side against the last 2 inches of each side of the board, and screw it together. This is done by lying the board on top of the 2x4's after you have laid them out in the correct shape on the ground.
Then add one more 2x4 to each board, crosswise in the middle between the others, to prevent torsion.
Then, drill holes through the 2x4's, through the "4" side, towards the top and bottom. You will put bolts through these to hold the boards to each other. (More probably, you will just screw them together because you will run out of time.)
You will need longer bolts for the corners, and to drill through the whole depth of the 2x4 (so going in the 2 side).
Top
You will then make beams to hold it together on top. Take 2x4's, long enough to span the width. Attach brackets to the ends, and screw them into the opposite walls. This will both make the sukka sturdy, and also be place to lay schach. Use mats. You can even staple down screens (ask your LOR) to keep out buggies.
Door
You will cut out of one of the boards the size of the door you will buy. Buy a regular bathroom type door, that comes with a doorframe. You will need to make your 2x4 frame in a funny shape around the door frame.
Light
Buy outdoor lights, run a wire, and drill them into the boards.
Caulking
The better you coat it with polyurethane, the longer it will last before it is too warped to easily put up and down.
Long term
It will warp. You will get tired of taking it up and down. You will leave it up year round. If well constructed, it will last about 10 years.
Cost
Not cheap. The lumber will be expensive.