We use this set up. First we installed a Scotty side mount on the Port aft section of our Selene. Had to use a piece of 3/4 inch starboard as a spacer to clear the cap rail. Then I picked up a 90 degree Scotty mount that goes on to the side mount with big wing bolts, they came with the kit. Picked up the fish cleaning board off of eBay. A guy down in Florida makes them in all sizes, we wanted a big one that would support the Weber gas grill, tools, platters and be easy to clean. Oh ya, it also is a great fish cleaning station.
Remove the two wing bolts, and the cleaning station comes right off and we can put the Scotty down rigger on.
During the winter we remove it all for the Canvas to cover everything.
By the way, the Weber grill is the only way to go. My experience with Magma's or any other Stainless grill for that matter have not been pleasant. This is the grill we had on the Coach before we got the boat. Its now 7 years old. Once or twice a year I remove from the boat while the power washer is out and spray the daylights out of it.
And on this trip, Tom on ASD is so impressed that they are searching for one themselves.