He used to be my companies workshop foreman so was very qualified when it came to manufacturing it.
I got the material cheap from a supplier, had it Louvre punched for free from another supplier, then we rolled it at Bretts workshop, one saturday morning.
I think it came out really nice, made from 1.6mm aluminium which gives it a bit more strength than 1.2mm which most people use, hardly any weight difference to it.
Managed to track down some over centre stainless steel catches for around $40 from one of our fastening suppliers (Allfast).
Total cost of bonnet is around $40 and 12 beers :)
New exhaust on in the above photo too, still have to make a cover for it. Will replace it with a stainless steel one at some stage.
New bonnet makes all the difference!