JH, Is the roof already framed? If not place 2x4 roof rafters 2ft. on center, cover the roof with 1/2 inch plywood, place 15lb. tar paper, and finish off with an inexpensive 3 tab roof shingle. Figure on a solid 6-8 hrs to do it by yourself. Just the roof should work should take 2 hrs. For that drawer why not try epoxy in the joints.