Thanks, MarineGirl.
Yap, the four walls and both bottom end pieces are 1/4" thick black acrylic. Other then that, rest are 3/16" thick clear arcylic. I have 1" wide around the bottom to create ledge to hold the reflectors. Both refelctors are not fix to the box, they just sit on top of clear ledge, it is very easy to remove from top. I add a clear center brace to increase its rigidity, also that space let me put a PC light in the middle. I run MH only, PC just run 30 min. before and after MH.
I provide all the dimensions and local plastic shop cut each piece to the spec for me, I just glue them together. Overall canopy box cost is $65.