I only needed an 1/8th of an inch of space so I filed...and filed...and filed....
With the filing done, I attached the skins to the frame...here you can see the pocket vent is now in place.
And after much effort, the octagon port fits!
Next up is the rear door/access panel. I taped it into position so I could ponder a few ideas on how I want the rear door secured into position.
Since I need to leave the lower frame ring pretty clear for the electronics tray to fold out, I think I came up with an idea that will work. I cleaned off some excess silicone from the back of the coin returns and JB Welded a large, ceramic magnet on each. Tomorrow, Ill tape the door back into position and see where some iron/steel brackets should be place. Whether that will be enough to hold the door into position securely remains to be seen!