I have built a second protoype with a few modifications and adjustments and was mostly satisfied about that version. I have not made any progress since late may. Then, I was moved on another shift at work for about 1 1/2 month and could not work on any project.
I even delayed grandpa's bus project which I expect now to be ready for is birthday in december.
I am currently focused on the Airflow and will be happy if I get a complete protoype in order to meet Ryan's design contest deadline at the end of september. It still sounds feasible if real life does not interfere too much until then.
Thanks for your interest!
Cami