Hi Vince, if you take a look on this page :
pages.infinit.net/gtj101/awt.htmYou could see 2 types of board, one long windskate board and a small one. They are arround 36'' to 30''. As you could see, I have many holes on my boards to have many options. It's like windsurfing or surfing, every little details offer something else.
To Start, a longer one is good. As you could see, I suggest some good trucks, the inde 215 mm and the biggest wheels ( you could go for 70-72mm hardness a80 ) for more stability, easier and softer planning ( ;) Rolling ).
I would like to help you with my boards but the shipping is a problem. If you have time to make yourself one, I suggest also to try to have a slot for your mast base like on a windsurf board. You will need some blocs to raise the trucks to allow the bolt to be under the trucks ( best general position ) . In the same time, you will be able to loose the king pin and have more control on the direction.
Something like that would be nice for you.

or with even bigger wheels for more stability

Cheers!