So we are trying to do some remodeling and running into some snags. If we try and just remodel my house and add on space gets kinda funny. One of the things we are trying to make space for is all "my stuff" as she puts it. In the long run I want a shop and that is where all "my stuff" will go. So it seems semi silly to try and add space that is really not going to be needed in the long run. So one option I put forth is to build part of the shop in a way it can be added to later, but would get "my stuff" out of the house now. But my house still needs lots of fixing up, just won't be adding on to it. So my basic idea for the shop is to have some rooms down the sides with a large open middle. So for now I was thinking about just building one side of the "rooms" so it would basically be storage for now. There will not be any roll up doors, just man doors. It is going to hold all our SCUBA gear, my tools, Fire/EMS equipment and I was considering my guns. The largest thing I own right now is my 30' enclosed trailer so I am planning on a shop that is 40' long. So right now my plan is building a 20' wide by 40' long section to start. I have a few questions. First what is the most cost effective building? I have looked at steel, traditional and then I did see some pre-formed concrete. I will be doing the majority of the work on my own, with help from friends/family. The second question has to do with the "gun room" part of it. I know a military ammo bunker would be best but I can not afford that. So I was wondering about the difference between pouring concrete walls, doing cinder block walls, or just heavy duty walls (say 5/8" plywood outer, 5/8" plywood inner finished with 5'8" sheetrock). The room will be 20'x20'. Any thoughts would be great.