Re: GIS, First Mate, Argie 15, others?
Haven't been aboard the other two, but can speak to the Goat Island Skiff. Harbor Woodworks built the first one in the Americas back maybe 16 years ago, and it is now our family sailboat.
It IS about as simple to build as you can find... and still end up with a real boat at the end. And not just that, but a better-looking boat than I expected from the drawings and few fotos available at the time.
It's also a very versatile boat. We've used ours as: club racer; expedition boat; rowboat; motor/fishing boat; swim platform; messabout/riparian poking about boat; and more.
If you like going fast and sailing hard, the GIS is there for you. If you want MY normal mode of 'don't make me set my beer down' sailing... that's easy enough to do, too. How you manage the sheet/downhaul, or if you toss in a reef. Rows well. No Whitehall, but I've got long distances. And medium distances with her loaded down with two boys and load of island camping gear. Motoring is fine but slow with a tiny outboard. Any attempt to apply power only results in a nose-up attitude, less visibility forward, and no increase in speed. 2 hp is fine. We started with a 6hp, cause it was handy, and boy was THAT overkill.
Regarding stability, the dory-hulled GIS is tiddly with only one aboard. I solved that by using a pair of cheap sandbags alongside the daggerboard case when sailing solo the first summer we sailed her. Add even a second body, and the stability jumps up. More bodies only adds to the effect.
As far as body-capacity, we've transported mobs, by oar or outboard in calm conditions. I think 9 was our record. But sailing is a whole different kettle of pirates, of course. Our typical is one or two... or three. We've done 4 a few times, but it's tight. And your kids WILL keep growing. Keep in mind, though, that our family's story is not atypical. By the time my two boys got big enough so that it was had to fit us all in for a sail... they were more interested in other things. Or in sailing alone... or just the two of them for boat-camping adventures. So the size limitation was self-correcting. And the larger the group, as they get older, the harder to coordinate schedules for an outing.
If you want roomy - and are willing to make it a bit longer project - you could also look at the Welsford line: Houdini or Navigator. More hours... but you CAN jumpstart the process with a kit.
Good luck!
David G
Harbor Woodworks
https://www.facebook.com/HarborWoodworks/
"It was a Sunday morning and Goddard gave thanks that there were still places where one could worship in temples not made by human hands." -- L. F. Herreshoff (The Compleat Cruiser)