Hey Andy, I love your work and have used plenty of your tricks so I'm not being picky ok.

I made a ali valley tray for some 516 heads that I was using on the track years ago, the problem I had was the thin (1.2 mm about .050)tray broke it' seals on the front and rear of the engine because of vibration. I think your idea will need the flat bars each end and you will need to look at the join. Cheers Al