I have not fully researched the item but i believe it may be similar to the schnellboot italeria conversion, a longish running thread by Buzzer, that should be investigated.
its not much use of course, as everybody has done their own thing !!! It is apparent that all persons involved have had success as per their requirements. so you takes yer choice.
AND I would do it differently to the others. There is no right or wrong here. I will reiterate a point I made and that is a chap on our pond was doing something similar with I think a slightly smaller boat and was using brushless motors on ridiculously small 20mm props. Casting my “expert” eye over this setup I thought, and luckily didnt say, that the props were far too small. Can I have been more wrong, the thing was jet propelled.
If the boats are the same I fancy the SHG approach of shifting things a bit to give a better centre of gravity on the distribution of weight thing, as this will give better pond manners when running fast (lets face it, the only way to run a schnelboot) .380 motors are fairly powerful and cheap, and can be replaced with speed 400s directly if required. 35mm props suit either assuming thats the size of the kit. A change to 30mm may even be a better match (brass)
Tip of the day..always keep your gob shut at the pondside until after the first run…
Ashley