Think it will fit, it did mine. Have used this powertrain, with minor changes, on other models of about this size. if anything it overpowers them, but on the congested waters where I often sail, it is good to have a reserve.

thanks RHBaker,how did you come up with your electrics. I will have a look at what you have used and see if I can adapt to my boat.

HI Gary,
Built a similar model last year to 1:20 scale, used:
2 x MABUCHI RS 555PH-3255 12V 5500 rpm DC Motors.
2 x Viper 15 "plug & play" ESCs
2 x 40 m/m handed propellers- direct drive.
Driven by 2 x 6V SLA (sealed lead acid) cells, connected in series.
Performance seems quite realistic, although am thinking of going to a LIPO style battery pack to reduce weight. Speed is fine, but the model tends to sit a little low.
Rowen