Aftermarket Engine Cover [bomex replica]

Hi Guys
 
I manage to aquire a second hand Bomex Engine Lid replica of one of the guys here,
 

 
At the moment its been screwed and rivited into a turbo engine lid - looks really messy and follows no form.
 
What is the best (or Proper way) these are mounted on to a car - I am assuming you need to attach it to an engine lid of some sorts. I do have access to both a turbo and NA engine lid I can hack up for this purpose.
 
If I could get any advice on this it would be great.
 
edit: Please dont say leave it to Pro's - taken time and had the learning curve of doing everything on this car, would like to keep it that way.
 
Thanks,

If I remember correctly I thought he had a Genuine Pheonix Power one - which is just a 'bolt on' direct replacement.
 
I will have a look, Thanks