I'm redoing my MCM...one man job, and taking longer than expected, of course. I will include this in the before and after thread. the original tongue and groove redwood siding was past its prime. I salvaged as much as possible, and will be using it in different parts of the house. the exterior walls have been taken down to the studs, new insulation, and then re-sheathed in 3/4" plywood. the "house wrap" is a german product made by Cosella-Doerken for open cladding systems..creating a rain screen. the exterior is now being sheathed in 16 gauge A606 "CorTen" steel with each piece plasma cut by hand, and then attached. I started last fall. should be done later this spring. I spoke with the original architect (an understudy of FLW), before he passed, and got his blessing before I switched to the CorTen. Will post more pictures once progress ramps up here....