Plenum cover

I was curious if anyone has installed a plenum cover on an RV-14 or 14A rather than the rubber baffles. If so, did you fabricate it or buy it from somewhere. I am not dead set on the idea, but wanted to explore the options before I order the FWF kit. Pictures and info on how you did it would also be greatly appreciated.

Given how well the baffles work on the -14, I'd be hard pressed to buy into an argument for a plenum (I've heard the argument, just not fully bought in). I haven't seen CHTs above 380 or so, in Florida, in the summer. My cruise CHT's are 320-330 range.