Rear view showing how the panel is spring loaded
Front view showing the door closed in bottling position
Front view showing the door open ready to swap bottles
Close up of door latch (and yes, that is a regular door latch which I had in my junk box)
Close up of door latch with door closed
Note - I didn't put the wood stain on this to make it look pretty - I wanted to coat it with polyurethane to prevent spilled beer from soaking into the wood. I happened to have a can of combination stain/polyurethane, so I slathered on a couple of thick coats.
I didn't chill my bottles beforehand, but I did make up a couple of gallons of StarSan a couple of days earlier and chilled that. I put my Vinator in the bottom of a 5 gallon bucket and dumped in about 1 1/4 to 1 1/2 gallons of cold StarSan (almost, but not quite enough to float the Vinator). So when I sanitized a bottle, it would also be cold and wet, both of which are supposed to help prevent foam. The reason I put the Vinator in a bucket with so much StarSan was to have a large thermal mass which would not be warmed up much by chilling a lot of bottles (I bottled 33 yesterday).
So after cleaning the CPBF by running an OxiClean solution through it, followed by lots of water, followed by StarSan, my procedure was as follows (assume a filled bottle is in position):
Grab empty,sanitized, cold bottle from bottling tree with left hand, grasp filled bottle with right hand, pull lever with left hand, then move empty into postion. Remove full bottle and immediately push empty up onto CPBF. Set full bottle down on table just to right of station, then use right hand to close trap door, pushing up empty bottle onto stopper under spring pressure. Close vent, turn on CO2 to pressurize bottle, then open vent to back off about 1/2 psi to flush bottle. While bottle is being purged, cap the full bottle (if there isn't enough foam to cap on foam, tap the side of the bottle to make it foam). Then close the vent to pressurize, turn the valve to the beer position, open the vent to start beer flowing slowly into the bottle. While waiting for the bottle to fill, sanitize another bottle and hang it on the tree. When the bottle in the station is full, turn off the beer with the valve, open the vent a little more to vent pressure, and we are back to where we started.