My experience is that tank foaming is much more critical in a multiengine project and air bubbles will often shut an engine down. Packing foam as though it was a single simply does not work for me. Any tank adjustment or work is subject to replacement of the foam tighter or looser. When possible I prefer for the tank to be boxed in on all sides with an exact dimension from the tank (3/8 or 1/2”) so the foam will be the same before and after tank work.

I also prefer to have the capability to shut an engine back to idle with the radio to gain the experience that will inevitably be necessary. Sooner or later one will go out. Learning all there is to know about single engine flying in the few split seconds after an engine goes down is not considered possible. I let a friend experience simulated engine out on my airplane a few weeks ago. He had difficulty maintaining altitude, orientation and control although he knew when I flipped the engine to idle and back to power. After the flight he commented that the throttle was no value with an engine out.

Bill S