Talk to Dave Galley, he has articles in the magazine. I don't know if he still takes on these projects, but he is very knowledgeable and has done a few.Ray D
I am real sure that the last comment will insure NO One will help out!I am doing slide outs on a MCI EL3. I gathered all the info and drawings I could and then hired a local structure guy ( also gave him Daves book). For a fee -- NOT FREE - he did a set of drawings for the structural mods needed. There are a lot of mods not directly around the hole in the side. Many mods to the the underside of the bus and other parts of the bus. We used 40 LBS of wire in the wire welder making the mods! Be safe - not sorry. There is more to it than meets the eye.JimH