As with everything, there are always trade-offs... You are trading extra resistance to corosion (stainless) for half the weight (aluminum). Another option, if you're concerned with corosion would be to have the panels anodized or powdercoated, this way you'd still keep the light weight.
If you really want stainless, and don't mind the added weight, then Mike Forte has precut panels for the whole engine bay.
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