Tim, The side guards are from the Powermatic guard and are 3/16 in. I wanted to use 3/16 for the upper box but settled for 5/32 that I could get locally. The 4 in. tube is 1/8 plexiglas since I couldn't find one in lexan.
Dan

Dan, for your tablesaw overhead duct hood, what was the thickness ofg the lexan that you used? Thanks

Tim in Houston