These guy built a nice light weight fishing Jon boat......

https://www.youtube.com/watch?v=Ol-jVJej72M

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Buy a 14-15 foot all welded Jon boat with a 0.100" aluminum hull that is 48" wide at the bottom and taller 20" transom.

Get a galvanized trailer with largest wheels possible.

I would put the newly designed Yamaha 25 hp 4 stroke 20" shaft tiller outboard.

Put a 50# thrust 12 volt Minn Kota bow mount autopilot {white Salt Water model) with two deep cycle batteries.

Have some 8 foot oars too, for drifting rivers.

Get a large screen fishfinder/GPS