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As Scottracing said, but i think id create the ribs as L-shaped plates (maybe T-shaped even), as the ones you already have. That way you can use pop rivets to attach the ribs to the plate (as done today). I recon after some use, running over the curbs and such the edges of the ribs will get alot of beating. That way you can easily replace the worn ribs.
Also keep in mind what is over/under the diffuser, if exhaust, turbos or engine is close by, you might consider high temp resin.
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