There exisrs several electric motor kickers on the market. Briggs makes one. This one you posted is the most impressive I have seen.
There are trade offs on electric power and also the Kort nozzle. I can't remember all the details.
I am gonna build something electric powered for my wife. Still looking for the crappie jon.
Here is another link to TM modification. Other folks screw with TM too.:p
I did this (similar) on that big rc boat I built 4-5 years ago. I ran 24 volts on the old Sigma 23. It really scooted the boat.
Endura PWM Powered
I wish I could buy a Kort nozzle and prop for my tm. This arrangement is 30%-50% more efficient than open blade (up to a certain speed). This could mean you could use a 50 lb thrust tm and have the power of the 100 lb tm.
Half the expense. Guess what??
It is not that I am an expert here, it is just that I have tinkered with this stuff on my robots, and I know what don't work good.:o