heres some pics of mine.
How i made it:
I used 1/4 in expanded aluminum that i got from a friend in the fountain making buisness. First, I took measurements of the grill opening, then cut the aluminum to the size of the opening + 1 inch all around. I then bent the extra 1 inch inwards 90 degrees. To mount the grill I made up 3 aluminum L brackets, they all bolt to the underside of the bumper (where i drilled 3 small holes) and the bottom of the grill.
To mount the grill on the top, I removed the 280Z signal surrounds and used the holes they bolted into and just screwed 2 stainless bolts to keep it in place...one bolt on either side. (Make sure you use no rust metal like stainless or aluminum if you do this...) it's tricky to get the hood to clear, but with enough trial and error and slight adjustments to the grill you can get it to work no problem.
all in all, i'm happy with the results. i think it actually looks better than the 432R style grill because mine sits flush with the body, where as the 432R is recessed. And mine also hides the (ugly) 280Z turn signals.
heres the 432R grill to compare mine to: