I am planning the construction of a large scale dodecahedron infinity mirror, and so far the largest cost by far are the glass (or similar clear, hard material) pentagons. Each panel would be screwed on to 3D printed frame parts, amounting to 6ft tilted on a vertex. Each pentagon would be 24 inches per side, the diagonal being 38.83 inches. Therefore at least a 40 X 40" clear sheet of 3mm width would be necessary to score the pentagons.
My question is, is there any material that could be economical? I was quoted each piece at around $150 (acrylic), so very pricey for 12 of them to make up the dodecahedron. I considered stretching flexible plastic sheets or mirror film alone, but that would inevitably be subject to wear and tear as well as a warped surface (i.e. funhouse mirror rather than flat and accurate).
Hope this could be answered. Much thanks in advance.
For reference to the project, it would be similar to this: https://www.youtube.com/watch?v=WDK5xYHuQf0