Here is a grainy picture of my honwave aluminium floored 3.5m sib taken standing behind the transom.
These sibs come with one seat but there is two mounting points for the seat. Mines is mounted in the position nearest the bow.
I sit on the right hand side tube and steer left handed with the tiller.
The transducer is mounted near the waterline on the right.
Follow the cable near the launch wheel bracket.
The garmin colour display is mounted to a steel plate which is screwed onto the underside of the seat.
A simple and effective set up.