The GPU inlet/outlet sits a lot higher than yours. I originally had to use two 14 offset rotaries daisy chained to bring it up above the edge of the GPU ports.
The GP riser couldn't sit where yours is as it bunches up the cable so hard and hits the fittings. Bring it forward and I cannot use the outer GPU fittings. It's practically flush with the edge of the case. The GPU outlet port still hits the outlet CPU fittings.
Yeah, PMMA is acrylic. How often would it need to be changed with distilled?