If you want to use a RHP, you could cut some plywood to shape and secure the RHP to it, so it can fit as a partial lid, then cover the rest with plexiglass, so you can have lights and venting. I think another option would be to use a screen and use heat lamps. I think attaching an RHP to plexiglass would not work, because plexiglass melts pretty easy in my experience, but I have never done it, so someone else can provide feedback on that. Make sure you have a way to secure the lid in place.