ohh and about the topstage shield.. i can see the left side wall of it goes down to the bottom but is the a top back wall of the shield that goes across the top of the heat shield (horizontally)?
hmmm i dont understand you there mate, but on the airflow meter side theres a shield there & that goes to the front of the car and then sits flush with the suspension tower, and the top cover just sits of the top, when i get my car back from the panel shop i'll take another pick of it with the lid off.
before i got that top stage box i tried making one out of tin sheet i got from bunnings it turned out ok but when i bent it to make a lid the bends where all over the shop looked pretty dodgey.