I left the previous frame on the tractor. It could not be fitted to a different tractor, one would have to build a new subframe. It's like front loaders, they make them all the same, you just need a frame for your type of tractor. Right now this is an advantage because I will build it quicker
Work for yourself and market your products. If you can do that you will be more successful than being an engineer for someone else. Your talent is envyable. I'm speaking as a non technical type that has worked for himself for the past 28 years.
Great stuff!