I would go with a 16" HB at the console, they have the best side and down period and good mapping as well.
On the bow I would go 16" Lowrance or Garmin. Definitely not HB Mega.
I've had all 3 major brands of FFS. I absolutely love my Lowrance AT2. Some prefer Garmin. Both have their plus and negatives. Sorry HB Mega but no way.
Power Pole move for the trolling motor.
Cornfield Fishing or Beat down for the mounts.
I really like my motorized pole that is attached to my trolling motor from Cornfield Fishing.