Michael, nice work on the plans. I'm wondering about your sthheaing choices 3/4 plywood all around. I'd think for a mobile dwelling you'd want to keep the weight down as much as possible. Mobile or not, many builders might want to keep the cost down. 5/8 ply or 1x lumber is enough for the floors, especially for the loft where standing is not possible. 1/2 plywood would be adequate for the roof and walls (assuming 16 stud spacing), and even 3/8 might be enough on the walls. If a metal panel roof is planned, then more weight could be saved by installing it on wood strapping instead of ply.Also, is that a second layer of plywood underneath the house? That could trap moisture within the floor cavity I believe the glue layers in ply act as a moisture barrier. If there was a water leak that found its way into the floor system, it would take a very long time to dry out.You are doing a great service in preparing these plans for anyone to use.