Staple some #8 hardware cloth to the bottom of the slatted rack. Nail two 3/4" by 3/4" strips the long way for rails so you can slip a tray under it. Put it on a stand and use it as a SBB. It works great. Better than a regular SBB as you get the advantages of a slatted rack as well.
This set up eliminates my bottom-board feeder, right? Are you suggesting using the tray to feed? No...that wouldn't work because it's open. Sorry for my lack of creativity here, but how do I feed if the slatted racks replace my feeders?
(By the way, Michael, I doubted you when you said the converted-bottom-board-to-feeder would hold up to a gallon of syrup. I tested it. It freakin' does. I poured and poured and poured.)