https://images.app.goo.gl/CJhxw42BRzaw9F3o7
Mine was,a,£625 seat upgrade but as I said hollow with this seat cowl specifically made for it. It had the same bolt side fittings but a bracket under the rear to fix to seat base. Vented on the top too.
What I'm getting at is you could do similar with old school cowl if you were brave with vents or scoops and build in lights. I never mention indicators because people do what they will legal or not. But you see what I'm getting at. Simplify what's there.