First I would like to thank all the great people on this forum whose story’s I’ve been following for a long time now. I was always close to start my own project. Anyway I stopped my plans a few times being convinced it makes no sense here in South Germany (black forest) with all the restrictions.
A little bit about myself:
I got into kiting 2016 - kitesurfing became The Thing for two weeks a year on holiday at north sea mostly. All efforts to kite at home ended in disappointment 
I think 2022 I started with pump foiling on the nearest lake which really became the thing closest to “real” surfing locally.
Last year I learned wing foiling which is also quite nice. Sadly also not the dream conditions here at home.
After getting good enough with the pumping I started imagining catching the waves at north sea must be really fun. So I got finally caught by the foil assist idea and quickly ordered some essentials:
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Chinese 6384 Motor is already disassembled and waiting for some resin at work
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Maytech remote for the start
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X-Cross ESC successfully disassembled
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CN-Linko connector mt60 (thanks @rttn)
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planning for a 12s2p pack based on Molicel P45
I have an appletree surf foil board 47l available I would like to use. With 76kg there should be no big issue getting started.
Regarding the enclosure I’m not sure yet. I started playing a little in CAD. Also I have ordered a Bopla A124 Box. To sum it up I have the following options:
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FD gen 2 inspired like @Bzhwindtalker. Advantage would be direct cooling by the mast base and not damaging my board. Biggest disadvantage I see is the remote connection and a neat, waterproof battery connection. I would definitely opt for a SLS printed/ milled housing once my design is good.
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Inset Bopla aluminium box from the top like @hangloose. But I’m not sure how good signal strength would be. I guess I’d need to make a plastic antenna stripe in the aluminium case - right? Also there would be the need to make room for the cable and connector coming from the motor. I’m not sure how to make the place for the box solid and looking good in an existing board?
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Generic FD gen 1 inspired deck mounted box. Could be either Camden or Bopla and also some temporary solution to validate the solution 2.
Happy for any recommendations I’ve not read yet or overlooked. Also happy to meet people nearby maybe for some pumping session in the 78**** region.
Cheers Joshi