cpbpilot,

You might consider lowering your cross-brace for the rudders to about half way down, then get a starter with en extension on the shaft. These MAY be available for ducted fans (I'm not a starter guy). I'd try to borrow one, if possible, to see how it works.

I don't believe I've ever seen an X-Acto tool box used as part of the model before...unique!

Looks like a fun boat. The only air-boat I ever built was a free running 1/2A one published in FM in the mid fifties. Lotsa fun.

Good luck with yours.

George