[electricboats] advice not on sailing boat

dear knowledgable members,
with pleasure i've read your interesting, thorough and often detailed post - what a joy to see so much expertise. i hope I could make use of that knowledge and ask for advice and recommendations on my little boat.


I is a small boat in the canals in amsterdam, just take it out to go cruise along the canals and sometime cross the IJ river for a restaurant/swim/friends on the North side of Amsterdam. 

It's a former safety boat, presumably built around 1920, riveted steel. 5,5m/18ft long, 5,2m/17ft at the waterline. she is aprox 1.85m / 6ft wide at the widest point. Guesses are about 1 ton without engine etc. These are some speed test i did a while ago;



Now powered by an old 21HP 3cylinder diesel i'm looking to change to electric this year. (Amsterdam city government issued rules to ban all diesel engines from the city centre by 2025).

I usually have trips of 3-4 hours, that may include the 20 minute full-power (about 11 kmh) trip to the North of Amsterdam (and 20 minutes back). Most of the time i cruise 6-7 kmh (3.5 knots?).
I maybe have 20-ish trips a year, also of 1,5-2hours, so say 50 hours a year - all in all an expensive hobby, but with friend on the canals, with a beer or wine and some snacks, cruising to the take-away pizza on the canal, romantic candlelight tours - it makes it worth it (well as long as you can help me do this electrification....)
The boat is docked next to my houseboat so charging is no problem.

no need for a lot of power but i do need be able to break quickly and have some manoeuvre power, also when i have 8 friends on board.

I was hoping on some recommendations on;

1. power estimates the engine
2. direct on ax or via belt (what happens with an emergency brake?)
3. how to mount/install, on the current engine mounts with or without the rubbers (need a custom made frame) 
4. what kind of propellor (don't know what i have now)
5. brushless or are older/cheaper engines an option considering my hours/year.
6. power need on 6-7kmh vs hullspeed (10,4? kmh); is if fair to say that at 6-7kmh poweruse is only 30% of the energy that is needed for the hull speed?
7. what kind of batteries would be advisable for me. the boat is in the water (and could be on power) all year. In Amsterdam it it maybe 10 nights a year freezing a bit, never more then -10 Celcius

I've seen the kits from https://www.kit-elec-shop.com and https://www.thunderstruck-ev.com/ but wonder if they are my only (affordable) choice, and, cautious about how to mount them.
I realise most of the converstaions here have been on sailboats and mine is different, still i hope you can educate me with your expertise,

Thanks,
Elwin

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