Really Nice Job. My situation was just slighly different.
PTO Trac Vac with 8" Input. I didn't see an AgriFab 8" option. I bit the bullet and bought the Trac Vac boot for the JD 54C and the fit is very good. So far working great and no engine to maintain. My setting is like your lots of Old Oaks and Hickory. Now what I would like to find is some 8" quick disconnect options for the Vac Tubes, expecially at the trailer.