Should do the trick, is that Oak?
Suggestion: now that you have the pattern, make another set with screened cutouts for summer nights. Then after you've done that, spend a few hundred on some teak boards and make yourself a nicely louvered set out of teak.
You'll still have spent a lot less than the $1000 specials you mentioned!
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"