First of all I am not in an engineer but work with a lot of them in steel tubing in non construction. I want to build a building out of 1.5" sq x 18ga galvanized steel tube. I want to put them either 2' or 4' a part and from there place solid sheets of polysterene in between and on both sides before sheething and dry walling. Problem is in my county (I am in Ohio) they want and should have plans registered by a professional architect and/or engineer. I need to find someone I can talk to about this. I have seen a construction method use 1x2 x 18 ga opposing each other with 4-8"styrofoam in between and screwed together. I think its over kill for me. I am a bit desparate as I have a 6 month stalking situation and need to create a new home for my family elseware as economically as possible. I have also tried to liken my construction to green house building. Can anyone refer me to some help out there?