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Dave 3" would prolly work 4" might be huge. I saw you had that on fb. I was actually thinking about building this today while on the road driving to my jobsite.

my exact thoughts! ive been trying to come up with something..... going to look into this!

If you hang a curtain in front of it, you can solve dust problems, too. The curtain can just flip over on top when you want to see the cars.