Semi-recumbent tandems have been made for years, I think the first ones are made by Bilenky:
Viewpoint is more recent model, Opus is older version:
http://www.bilenky.com/viewpnt.htmlThen Hase Pino:
http://www.youtube.com/watch?v=sXwCxCizxWMBoth of which cost well over $3000 or $4000.
My semi-recumbent tandem (under $2000) was made in Taiwan by Performance Recumbent:
http://www.performer.com.tw/
No. it might not hold up for duties like 3-week long self-supported touring with camping/cooking gear but for around town grocery/breakfast runs it's been great for me and my 5'0" wife. Since the stoker sit in front, she doesn't have to stare at the back of my head, gets full view of the road.