If you search the fora for the motorisation used, you'll find that two 700 motors would work well in a light scratchbuild hull, but it's too heavy for theEquipage hull, as you'll need 12-24 NiMH or the Lipo equivalent to power these motors.
Two 600 motors will be on the edge to get such a heavy hull on the plane, the runtimes will be short, due to the weight restriction, which will not allow for large battery capacity.
The weight/power ratio of small brushless motors is much more favourable for your hull, with two long can 380 1300-1500KV motors you'll have more power than with two 600 motors.
Using the (relative) light Lipo's as a powersource is a much better option to get this boat running on the plane in my opinion.
If it were my hull, I'd add glass cloth and epoxy resin to the running surface anyway, as the hulls are assembled in a very humid environment and if it's only covered in resin, or varnish, it will dry out and crack over time...
Regards, Jan.