Gaff Rig Design

I'm in the design process for a Steel 45ft boat. I bought a set of stock plans for the Vickers 45 AC designed by Dudley Dix. The design comes with a bermudan rig, but I would prefer to have a Gaff Rig with topsail and Bowsprit. Could you either point me in the direction where I might be able to get a sailplan for reference to design the rig for this boat. I.e. A sailplan for a dsingle masted gaff rigged 45ft boat.

Any help would be apprecited.

Regards
Steven Prince

steven_prince@lycos.co.uk