When choosing components for a custom rod I consider the abuse, stress, wear and frequent use a rod will face. Therefore I use the best components for that particular situation.
I think a trolling rod goes thru tremendous stress especially when a hookup happens. Even when winding in fish the boat is still in gear.
For a trolling rod I use a Fuji DPSH type Heavy Duty Salt Water Reel Seat.
I also use these reel seats on all my heavy duty rods such as blacks, blues and bass. A reel seat has a lot of stress placed on it.
I select the reel seat size based on the reel being used. Can you imagine having built a custom rod and finding that the reel you want to use does not fit into the reel seat? It happens.
Sometimes the blank size and/or grip size can determine that a larger reel seat is needed. The customer wants thick grips so I use a larger seat to create a smooth visual flow up from the butt.
I use 4 masking tape rings, 1/2" wide tape, under my reel seats. I use enough tape to create a tight slip fit. The seat slids over the rings without forcing the seat into place, but it stays in place, does not slip ot turn.
I fill the area with Rod Bond epoxy. Slide the seat on, spreading or removilng excess epoxy as needed. After locating the seat on or under the spine I rotate the rod at high speed on my lathe for 15 seconds. This is to equally distribute the epoxy inside the seat. Then I recheck the seat alignment and clean all epoxy residue.
Hope this helps.