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I would consider skipping the stem-to-seatpost solution and going for an extra 'headtube'
How come? Wouldn't the alu stem be lighter and give you more options for adjusting length then an extra headtube?
(Although I can't for the life of me work out how you get it on/off)
Edit: its steel and I think it's brazed on so ignore me.
hugo7-
Maybe I was unclear. The above picture just got me thinking if it could be done differently. I don't think the frame above is nearly as clean as 7ven's sketch. (Croft's sketch??)
It is just that the stem height of the stoker is determined by the seat post height of the pilot. It would make the frame more flexible in the future if it could be separated, and if you could use that for actually stiffening the frame it would be a win win..@7VEN: FSA SLK Light is shit. I have just had the threaded alu insert come loose in the drive side arm. FSA is pushing the responsibility over to danish local dealer who refuses to do anything about it.
Hulsroy
Found this in my flickr feed earlier today... Beefy and modern, but with a different approach structurally...
I would consider skipping the stem-to-seatpost solution and going for an extra 'headtube' and use this for both structure/strength and stem holder. Maybe... ;-)