travel trailer floor section replacement

I have replaced two sections in mine. It is not easy,get to the area that needs to be repaired by doing the least you can. I removed my rotted wood, took a 2 x 4 and cut it down to match my other floor joists. I made a frame and attached it to the other joists using screws, soaked everything down in Linseed oil for extra wood protection, then put down new wood. I recently bought a Sonictool to use for cutting in the future. It works real good when you have to cut up against a facing. The way I start out is getting a cup of coffee and look at what I need to do to remove before I even do anything.