Small update...
I have completed the airbox/carbs assembly, cutting out a large section
of the housing to install the PE mesh. In reply to a few user requests, I'm posting a better view of my building board. Each aluminum post is height adjustable after measuring and drilling for the the axles, and pivot. I use a small hammer and block of wood to tap the post until it is at the right height.
Now the bike can be handled sideways, even upside down if necessary, by holding it only by the base.
