Expresscraft makes several that will fit twins at a reasonable price
http://www.expresscraft.com/mticat.htm
to run drives like you want usually big $$$ like and usually around 60" ............. a normal strut like Speed MAster will drop $$$$ lots and allow you to run them and tune them way easier to set up and build
MHZCt03 / Mystic
HPI CT04 / Mystic are a couple like you want to do but these are also 3 or 4 times the price of a Expresscraft
there isa few MTI twins on here if you do a search and run awesome and look very cool ......... u can run twins in a lot of boats ... but weight distribution becomes a issue with many so handling goes to ............
Good Luck with your quest
Cheers