Nice grill block!
Mine is fabricated from the spoiler off an early 90's Subaru Legacy wagon, and you can't tell it's not OEM. Insights look weird without a grill block to me now.
I mixed aluminum and coroplast on my first Insight's belly pan. Aluminum went over the engine bay and the area of the catalytic converter, and coroplast everywhere else. It's much stronger and easier to work with, and cheaper. Cheaper is important considering there's a real good chance at some point you'll run over something in the road that tears part of your hard work off the bottom of the car!
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