Julian, I am an old fogey, but could we possibly have \\\'stern\\\' or \\\'after\\\" cabins? I think it\\\'s a sad day when boats have rear ends. Am I starboard or am I port (as a nautical BFG might have said)?

Please  feel free. I think a poop deck is brilliant, and highly nautical. Even if you can\\\'t sit on it, let alone stride across it au Hornblower/Aubrey, would there be room for a small brass cannon, for firing appropriate salutes while lying hove to and watching the sailing world go by? I\\\'m sure the Commodores of all Yacht Clubs in the vicinity would be highly gratified. Do Classic Marine do cannons?

More on stern cabins....
The first diagram shows a BayRaider hull with a stern cabin superimposed. Note relatively large volume of cabin possible without reducing the size of the cockpit. Have to hang the outboard off the stern (ugh) or use some kind of electric drive. Forward position of the centreboard, or dagger board, (more usual with Junk-rigged sampans), would be balanced by a larger rudder than the usual high aspect ratio model fitted to BayRaiders.
With the main mast so well forward, to suit a balanced lug or junk rig, there would be no problem fitting a sprayhood to shelter the crew when making to windward. Minimal protection when you consider a major disadvantage of  stern cabins – as shown in the shot of Andreu Mateu s boat. In a storm, the cabins  windage holds the boat head to wind – no bad thing - but the hatch opens to windward!
Sean Moriarty s boat has a forward cabin, too,  which gives protection and bouyancy without increasing the windage too much. Incidentally, his boat has adjustable water ballast...see http://www.kerryrows.net/pages/boat.php

Yet more on stern cabins;
This is GRATIS, a steam powered, aft cabin design found in an obscure corner of the Wooden Boats web site while looking for info on junk rigs...

http://www.woodenboat.com/forum/showthread.php?t=71730

.....not quite to my taste but Ive seen uglier boats.

Tony said that, I would say differently.
All houses, sheds and ships on this planet have doors to windward, at least part time. Not a real problem.

The good thing about a boat is you can change course a bit to avoid the door is facing windward when you want to use it. And when lying at anchor, hey, why not spread a cover between sprayhood and stern cabin? Super simple with a stern cabin and gives a huge dry space underneath.

I should be working, but this is far more interesting. One problem with an aft cabin would be getting at the mizzen. The best solution to a problem is always to get rid of the problem. Rather than a yawl or ketch rig, how about a schooner? The mainmast could be stepped at the fore end of the cabin, maybe with a main sheet track across the cabin top. The smaller foremast could be stepped well forward in the cockpit. You could get at the luff of the main sail easily then, as well as any reefing lines. You may not need a jib at all. Would not look remotely like a current Swallow Boat, but could look very good. You should see Nigel Irens\\\\\\\\\\\\\\\' gorgeous, now lost schooner Maggie B
http://schoonermaggieb.net/
Her replacement M2 should be even better. She has just been turned upright at the boatyard
http://www.youtube.com/watch?v=Kvh8U6ofBqI
This is what she will look like, gorgeous:

Guys,
the world is so small.
Matt and I were at the Enkhuizen Klassieke Schepen Show last week and up came this guy with a truly amazing small waterballasted popup stern cabin sailer.
Have a look yourself, cannot a stern cabin look sweet? Best solution I have seen in a long time.