Not new to RC boats just to riggers.

I have a fast cat and a development mono plus an interesting air powered beast, I am looking to expand the family and add a rigger.
I can draw and build boats, I am looking for design tips and a good starting point.
I am after a rigger primarily as a straight line rooster tail spitting speed machine to honk down the pond.
If someone has some basic plans or can draw some basic ideas then that would be very cool. I am looking for hull forms ( cross sections ) for the forward sponsons and some overall ratios of length to beam, cog distances etc.
I have a hot 540 looking for a home, but may consider buying a motor and drive such as a speed 700 ??
There is a good supply of 3 and 6cell stick packs here and a lot of material to make running hardware, Rx gear, servos, switches etc. I know I will need a shaft and prop so any hints there would be good too.

Check out my air powered machine, I can and will build and develop a boat!!