So for the life of me I can't figure out why anyone needs this contraption! LOL
I am a firm believer in the KISS method and I just don't see where you need this for any reason. I use a 2 gallon bucket (food grade Midwest Supplies or similar). Scoop out a gallon or so of the cap out of a 20G Brute which has 10G of must, and then dump it in a gallon at a time right into the top of the press. The press has no paint strainer bag, nothing but wooden slats. Scoop a gallon, dump, rinse, repeat until you can pick up the Brute by hand and then dump the rest into the Press. Let it drain into the catch pan and then into your waiting bucket. I use a 6 gallon (food grade) bucket that a Mosti Mondial AJ kit came in with a nice snap-on lid. I get almost 6 gallons of free run. Then a gallon of press run that goes into separate gallon glass jug.
If a few skins or a few seeds get through the slats, no worries. This is step one in the clearing process. Those will float to the top and you can scoop them out in the next day easily with a spoon or similar. Once the 6 gallon bucket is full I use a racking cane to transfer that into a carboy via gravity feed. Sometimes the cane can get plugged with skins but if it does pull it out whack it against the side to clean and restart the flow.
I can do an entire press and transfer from Brute to carboy in 30-40 mins all by myself. I use the Harbor Freight dollies to move the Brutes and full carboys around from the winery to the outside patio and then back into the winery.
This simple set up works quite well for me. YMMV