can i take out all the side windows and replace them with metal panel
All but drivers and passenger door, yes. legally. You need not have a rear window or side, except in doors, if you have proper side-mirrors
Yes and gage the thickness of glass (1/16th?) and make aluminum panels out of 2024 T-3 .062 If the glass is taken out in 1 piece trace it out onto the aluminum with a black Sharpie marker & cut out with an electric skill saw & metal blade & debur & file the edges smooth. Re-install with the same rubber molding & use CRV silicone caulk for water leaks .
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