Sorry for so long before responding. I was just leaving for 3 months in Thailand when you wrote this, and then I must have missed seeing it.

How about something along the lines of this 'picnic cat' I posted over here
WWW

...and then adding a rig like this other Thai cat, the HK 40
WWW
(BTW this builder is no longer in business)

note: apparently I can not add a link in this message, so you better end me a private email

Hello. I am a recently joined but long time viewer of this site. I am interested in small power catamarans that could be fitted with a mast aft type sail. I have tried to find relevant threads here without success. I hope I am not breaching any protocols by
sending you a message about this. Is there a site or source of information for retro fitting a reaching type sail to small motor cats. I would appreciate any direction. Hope this is OK if not please accept my apologies. Regards annaG