We're constructing a run that is 24' long by 10' wide. We're building it out of treated wood, and would like to cut the stuff as LITTLE as possible. Do we have to cut birdsmouths out of the 2x4x12s that will be spanning the 10' side? Can we get away with rafter/hurricane brackets? The run height will be 8' on one side and 5' on the other, there will be a rafter ever 2' and perpendicular 2x3s running across them also at 2' spacing. It will be covered in clear Suntuf pannels (so the only real weight will be snow weight). Thanks!