Don't feel bad about your welding.

This is a 917 chassis.

Here's a scary thought; the Porsche 917, which won Le Mans 24 Hours for the first time in 1970, was capable of a top speed of 390km/h. And this is what its space-frame chassis looks like in the flesh. 

The bare chassis with no attachments weighs just 42kg. 

Steve Holmes.