Off topic - Harness mounting in an S2000

Has any one out there either seen or installed a harness in a stock 2004 S2000?

A friend of mine and I are trying to figure out if there are appropriate pick-up points to anchor the harness to. This car does not have a roll bar installed. we were considering the ptential of wrapping the harness to the roll hoop behind the seats. There is some concern with that since we don't know how much space is between the plastic covering and the actual hoop inside.

Any ideas would be appreciated!

Marty