I'm guessing you'll do lots of freeway miles and fewer stop/go miles because of its purpose. That means that you aeromods are more important that the (still important) weight reduction. The weight matters most in stop/go. And if you are going to lower the roof that much, you might look into better aero possibilities in the roof shape/slope.
Can you share a link to any of your band's music?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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