You should be sure what you understand as area and aspect ratio. There is a exposed area (which stick out of the hull) and the complete area. E.g. 0.2 sqm area and 1 m span or 0.1 sqm and 0.5m span.
Once you fixed your average chord, I know the Reynoldsnumber. I can than look for a good foil for this Reynoldsnumber.

Naca 0007 is very thin, which means less maximum lift. In other words with a thicker section you can have a smaller chord, hence less drag while still having the same lift and hence manouvreability.

In general airfoils are not to bad, but there are
a) much more advanced sections the NACA four digits and
b) dedicated hydrofoils offer more potenial

However you should be sure to achieve accurate surface and shape quality with your building process. If not you can take any tear drop shaped something.

Personaly I would take a hard wood plank, let it CNC machine and cover it with epoxy, then glass fibre+expoxy.

Cheers,

Klaus