Component list feedback

I am planning a build and would love feedback on the component list.

FS65161 120KV
Maytech remote
Flipsky seal 300 amp ESC
14s 10p 21700 with Panasonic NCR21700A cells
BMS https://www.aliexpress.com/item/32906575355.html 300amp single port

A few questions.

Any recommended kill switch/safety options?
Nickel strip VS fuse wire? (seems like most packs are nickel strip only, non-fused)
Is passive water flow to the ESC enough or should there be a water pump for this?
Any recommendations for a good intermediate level flat water foil and mast?
What waterproof electrical connections have you used and like?