Wheel/track floor contact material

[MrForbes]

Acrylic is generally rather fragile....and slippery...I hope you have a back up plan

[CryptoStorm]

The stuff we have was donated to us. It isn't actually acrylic. It's about 5/16" thick and tinted dark. Pretty rugged - I haven't been successful in bending and breaking a piece.

Point is, would it be illegal?

The main reason of the idea was because we can build tracks that are wider than many prefab systems. 4-6" wide

[MrForbes]

R6 Traction devices must not have surface features such as metal, sandpaper, hard plastic studs, cleats, hook-loop fasteners or similar attachments that could damage the ARENA. Traction devices include all parts of the ROBOT that are designed to transmit any propulsive and/or braking forces between the ROBOT and FIELD carpet.

Smooth plastic probably meets this rule, eh?