Inspired by the web application posted on the Build Houses guide made by Toni here, I decided to make an application that would also include the floor and roof material calculations, as well as making it multi-level capable. It also does the calculations per selection, and has fancy colors per level.
You can find the application here, and the source code here for anyone interested seeing it or making any contributions.
Any suggestions? Are there any materials that I am missing? Are there anymore bugs that are not listed in Issues?