I think you are right the starboard is originally the same as the gelcoat but changes over time. Here is my ? and I chatted with Bryan about this. I have the 2310 full tansom and I saw his photo there with the rod holder in the fish box @ the transom. I have alwasy though about putting a rod holder somewhere there and had though about mounting trasom holders but would rather not put another hole back there if it can be avoided. I like the idea of putting one in the center like he has in the picture shown. Problem for me is the measurements of that middle piece on the 2310 do not provide adequate room to allow for the OD of all rodholders I have seen. The measurement on my boat is 3" and smallest OD rod holder I have found in 3.25". Here's what I am thinking of doing,,,,buying a piece of starboard, making it 4" to accomodate a holder and cutting down the fish box doors to make the change. Bryan mentioned this boat is new to him and had never used this holder. I am thinking a 90 degreeg holder with backing plate and possibly doing something else to strengthen this with everyting apart. You guys have done some amazing work/projects, let me know you thoughts and ideas on this. Thanks