Hi Guys,
I seem to remember that Herb Adams built and sold an aluminum monocoque chassis. His was a Cobra kit and it was called the VSE.
Here is a link to an old thread here on Club Cobra that has chassis information and references, including some from Tom Kirkham.
http://www.clubcobra.com/forums/scratch-builders-forum/93643-recommended-reading-chassis-design.html#post913844
Anybody else remember the Herb Adams VSE Cobra, he was in Carmel ??????
Here is a link to the old VSE home page......this monocoque chassis was done in Steel not Aluminum but, the torsional stiffness and the overall design will give some insight to how to do it.
http://www.vsecobra.com/
They are out of business now, I saw the building for sale a few years ago, living quarters on the top floor and huge garage/work shop below.
Tony R.