This is my set up have not tried it on the water yet but I cannot see any problems,
I have used a piece of wood and a strap to make the whole thing secure for both towing and at sea this makes it all very stable
I am getting nearly full lock on the main engine,
The aux is a Tohatsu 3.5 short shaft,
I will be trying it out on the river in two weeks I will let you know how I get on