Do they make a set of wheels like that for us old guys?
Following your build. You are on the ball! We did it 23 years ago. It was stressful, but totally rewarding.
You probably know way more than me but, make sure you get what you want. We read a book back when, and the author mentioned that when you build your second or third house, you'll get it right! I can understand her thinking. We only did it once, and there were things we wish we did differently.
Also, write down everything. You won't be able to remember all that went on. I kept a daily diary, but it wasn't enough.