You might be better off buying the elite and selling yours. No one makes the glass side panel anymore so you'd be looking at more money to spend making one then the case costs.
If you can get the side panel, then the only real thing missing is 4 holes in your case, retaining screws, and some rubber washers to insolate the glass from the metal case. Just line up the panel perfectly so you can mark where the 4 holes need to be and be careful about the metal filings.