Mike Poucher summarized what we've been doing very eloquently.

Here is a French page on deco habitats:
http://www.plongeesout.com/articles%...gruissanot.htm

And the Google translation:
http://translate.google.com/translat...520douchet.htm

This has a lot more information about securing the habitat if you don't have a roof to put it under. When you calculate the forces involved, you realize you have to take the tie-down system very seriously.

Andy