Just put a seat back there. You can get cheap bucket seats that are Sparco knockoffs from eBay, Summit Racing, and several other places. Since you're installing a roll bar, you'll probably also want seat support bars. This will make it difficult for a child to get into the back, anyway.
Chances are, you'd be better off with a "normal" Metro. You can still chop the top, and the only modification is the side glass. You can lay the windshield and backlite down from OE without them leaking.
A 2 seater, for most people, is more than practical for a DD. How many times do you drive alone? I'm not disputing your need for conveyance for more than 2 people, but you see the point.
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