Parabolic Mirror Mold for Collimated Display

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This is a parabolic mirror mold I created for a collimated display. THIS IS A VERY LARGE PRINT (2.37m x 1m x 0.5m or ~93" x 39" x 20") and I am working on breaking it down into smaller interlocking pieces that can be printed on most printers. If you have the means to build it though, the focal point is 1.5m vertically from the bottom, and about 840mm from the back edge at the top (the name of the file suggests otherwise, but the principal point of reflection was cut from the mold making it slightly shorter front to back). How I Designed This Inspired by a gentleman on the internet who constructed his own 220 degree collimated display using mylar and a vacuum, I decided to throw my hat into the ring. It is roughly the same apsect ratio as an ultrawide monitor (21:9). It's no mind-blowing 220 degrees, but it is a true parabolic form (Y = X^2/4P) and should be able to create a decently sharp collimated image. Rather than the vacuum method, this is meant to have mylar stretched over the convex side, then painted with some sort of form-holding substance like bed liner or epoxy, where upon removing the mold one should have a concave mirror that holds its form permanently.