I recently modified my Honwave 3.5m ally floored Sib's seat to carry my fixed VHF set / aerial, battery, charging points, fish finder, plotter and voltage meter.
The seat is identical to my Honwave T3.8 so it is interchangeable between the two sibs.
I used it recently on my T3.8 around the Kyles of Bute.
The only thing the 3.5ae Honwave had that my T3.8 didn't have was an auxiliary engine bracket.
During the 70 mile trip I carried my Suzuki 2.5hp in the bow of the T3.8 wrapped in some rubberised foam matting off cuts which I roughly shaped around the engine.
I thought to myself if the Sh!t hits the fan and my Tohatsu 20hp breaks down I can just wrestle it aboard lay it on the airfloor and resort to using the auxiliary engine to get me back to port.
Thankfully all was well and the 20hp propelled me back to port no problem.
I did get to wondering how could I use a mount to use the auxiliary without having to drag the Tohatsu off of the transom.
Here is the result.....