I strongly suggest re reading <R5>... lots of changes there
just to name a few:
1. Any non-reinforced polymer‐based plastic sheet material (e.g. polycarbonate, PVC, acrylic, ABS, Teflon, PETG, etc.) may be used with the following constraints:a. Thickness per sheet not greater than 0.125 (0.3175cm).
b. 24 (60.96cm) maximum dimension on any one side
c. Multiple sheets of different plastic materials are allowed with no maximum area constraint.
d. Plastic sheets may be laminated together to form a block up to a maximum thickness of 0.5 (1.27cm).
4. Commercial PVC couplings (i.e. Tees, elbows, couplings, caps, etc.) 3 (7.62cm) or smaller are allowed
No maximum length constraints on any of the aluminum stock
No maximum dimensions on Non-Slip Mesh
This is gonna be a good year
It's a good things we're engineers who regularly squeeze out 'miracles' with a severely limited budget, eh? I think that's an important aspect that we as mentors need to show the students from time to time, and this year is a perfect opportunity. - JesseK [more] 
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