http://forum.miata.net/vb/showthread.php?t=532429&
Hmmmmmm
How to devalue your car in 10 difficult, time consuming, expensive steps.
Ah come on- he's having fun so what's the worry? I quite like some of the curves on display in that article
Looks a bit of a hack. A old technique was to bend steel brake pipe to get the profile and weld in fillets.