You may be interested to know that some of the patterns for what Martin and Ted do, both kit wise and mini kits, come from people on this list. I have done three roofs, and a set of gondola ends for Ted and one full kit for Martin, along with revamping of two of his other offering to create additional kits. Now I have promised two things for Al.
I don't say this to brag but as a gentle prod. If you have built some resin kits, you have a sense of what the patterns need to look like to be cast up. Athearn undecs supply the rivets. Get going already, this is not rocket science.
Bill Welch