Foil Drive Assist, DIY

So you disconnect the cable from the receiver side and connect to the programmer, or you have a T there ? It is actually two wires that active, right ?

I only use plug and play ESC, very powerful and sensitive trigger

Do you mean this Esc is PNP ?
Sensitive trigger using this ESC ? And it cannot be tuned in the settings? The Acceleration setting cannot tune it? What are the impications of sensitive trigger?

How do you isolate the box around the heatsink?

weld motor wires at 45degrees

What do you mean by 45?

What remote do you use ?
What battery configuration do you use ?
What motor do you use and how did you care about waterproofing?
How do you check the battery level when surfing?