My wonderful friend Antoine Hertenberger (Spanish/French architect) has sent me a collection of references and web links to answer my question: “Antoine! Can you remind me the brand of your tent??”
Antoine’s tent is the POWER ODYSSEE from VauDe: http://www.outdoorsmagic.com/gear-news/new-from-vaude-preview/6285.html
Here is attached another tent model: http://northernwalker.wordpress.com/2009/03/08/vaude-hogan-xt-first-look/
This is the link to a very interesting detail to joint any kind of fabric to an structure without piercing the fabric, it is allowing us no create waterproofed surfaces easily: http://www.hammockforums.net/forum/showthread.php?t=1805
But what Antoine really recommend us is to study is the interesting research done by Robert Gillis:
Antoine, Thank you very very much! And thank you Marta for being such a fast intermediare! I’m your biggest fan!