I have found several software programs that I use to develop my models, but all my models start in Sketchup.  Teaching someone to use Sketchup has already been done many times, and there is  a thriving online community using the product. There are Youtube videos:  https://www.youtube.com/watch?v=UsHRGDvN4sM and if you do an online search you’ll find MANY others.  There are written tutorials… Read More