Floorin it

Last night I started putting the floor back in the Airstream. All my welding, painting and frame work are now done. It's time to start putting the darn thing back together. I decided to start with the floor near the front door because I thought it would be easier to fit. Not exactly easy but by the end of the night, it was in place. I took some measurements from the side wall to the main beam in locations where I knew it had not moved. I then cut a piece of 1/2" plywood to 35-3/4 x 8'. I used this measurement because it would hit on the center of a support and I could bolt it to the frame. The wall close to the door was not supported and could be moved at least an inch inward and an 1" away from the trailer. Since my plywood was cut at a constant distance and my cut in the original floor was cut perpendicular to the trailer frame, I should be straight when it all gets bolted back together. One thing I remembered the next morning was that I did not install the aluminum shield that goes above the steps and under the floor. The aluminum protects the underside of the plywood floor because in the step location it is not insulated or sealed from the weather. I am hoping that I can just lift the plywood up and wedge it above the step stringers and I do not have to completely remove the floor.