Im sorry I dont have any pictures of the process, I reused the original frame side after I made cuts down the length, after cutting them out I clamped the sides to a saw horse and used the grinder to cut off the top and bottom so it was flat. I bought a straight and angle grinder from harbor freight for cheap. I have a small 140 amp welder as well, it was pushing the limit for the frame but it worked. I used polyurethane black roof caulking from lowes, it takes a week to harden, but its the strongest stuff on the planet, similar to a tire when its fully cured, I flanged the 36" tubs from jegs and tacked as many fingers of the flange I could and used 4 tubes of caulk from the inside and outside of the well then spread it with disposable 1-1/2" plastic putty knives, After I sprayed rubberized undercoating and carpeted the inside, its strong and water tight.