Welcome to KH. That works, and yes you’ll be knitting flat. I think I’d want to work the vent edges with non-curling stitches - seed stitch or garter stitch. It’s possible to have an overlap if you wanted to do that. On the back you would pick up stitches on the back of the front edge to extend the back underneath the front. Or you could cast on some stitches to match the front edge and then stitch them in place.
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