Thanks for the comments everyone.
The Headache rack / toolbox is scratch built like the real one on the truck I drive its still not finished yet.
Other scratch built parts include Battery box,air tanks and steps for the air tanks,rear fenders.
The air tanks and steps for them include about 52 different pieces to make a set for both sides of the truck.
Thanks for all the comments everyone.
The way I get the edge on any plastic is first I make a pencil mark on the edge's to keep them even.
Put a piece of tape on the mark.
Then take a file and rough it in.
Then 150 Grit sand paper to shape it a little closer.
Then as I get the parts ready for paint I keep working the edges untill there the way I want them.
Thanks for the comment.
I used Dupli Color Chrome painted over Dupli Color Primer
The tanks were striped using Easy off oven cleaner then filling the seams and sanded smooth.
Use thin coats untill you get the look you want.
Be sure it is REAL DRY before you mess with the parts or it will rub off and its back to the start.
Mixed up two kits and some scratchbuilding and came up with this.
Still got to tweak it but its getting close.
Its built around the Mustang frame useing the up dated parts.