Thomas Powers & Frosty - Thank you for your help.
Just to clarify, it is not that I don't want to follow other people's designs, etc., it's just that I am trying to learn what the different parts, measurements, etc. are, how, why, and so on. I simply learn better doing. I wasn't intending anyone to "spend their time troubleshooting my ideas", though in hindsight I can see that is exactly what I did.
Anyway, I do appreciate the feedback & I'll post again, with photos & drawings, when I get it working.
Thank you,
David