I used 1 1/2”x1/8” thick aluminum angle from Home Depot. It was a bit pricey. Riveting is super easy and honestly it was my first time using them. I used 5/8” plywood up front and then the floor and bench seats and rear hatch are all 1/2”. I have a portable fish finder I’m going to use. I’m hoping just find a spot and anchor and not really troll but I’m sure I’ll change my mind. Thank you