When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Would be a complete pain in the *rs* to do properly. It's not simply a case of "cutting holes" for the scoop and vents, the proper bonnet is stamped with recesses and mounting lugs for them, something that would be practically impossible to replicate, especially if you were working with a painted part.
If you need a new one, cheapest option would be breakers or pattern part.