Putting batteries under board

Hi,
How usable is such idea ?
It allows using cheap boards as base. I would make the box a bit more hydrodynamical friendly - but would it be enough for nice rides ?

You’ve seen foildrive right?

I think multiple people here on the forum built their own version of that concept with success so totally doable.

Yeah, I have seen that. And I know that it is doable.

But - once you have extra components under the boat - does it disturb much when you start foiling ? I have talked to my more experienced friend and he was worried about stability and maneuverability - especially when going off from foiling.

That is why I was hoping somebody who owns such solution could clarify this