Help with a livewell. Need suggestions

[BA17]

Alright guys. I am working hard out in Kansas and my 12 and 10 year olds found this carolina skiff, they went and talked to the owner and made a deal. Now the work begins. My 12 year old will be using the boat to play and catch live bait (bluefish) for tournaments. There is a swingback cooler seat behind the console with a metal frame. It would be nice to be able to have a livewell that can go into the frame as needed and the seat still used as needed. Here is the question: What would be the best way to accomplish this livewell set up. Not sure if a standard livewell will fit in the rack or if we will need to make one. How hard would it be to build a fiberglass livewell to fit in the rack? Thanks for all the help.