Hi James,
thank you for the reply. Yeah I will be using cast acrylic. If polycarbonate works with resin then it wont matter regarding the uv issue I guess. Because the acrylic or polycarbonate parts will be the vat wall only and won’t block the projection.
I currently print at 75um xy. Things I normally print are character models so I think the flexing might work okay as the surface area of the slices wont be too big as its also hollowed. Then again, I wouldn’t know how effective it is haha. I just wanted a more permanent solution as it is costly to replace the psp vat.