What are the dimensions of the acrylic frame?

The dimensions of the acrylic frame are 330 x 268mm, which is approximately 12.99 x 10.55 inches.

What material is this computer case made of?

The computer case is made of acrylic material.

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Computer Case DIY Open Frame Transparent Acrylic Overlock for ATX Mothboard, for Testing, Overclocking, Gaming, Support Longer Graphic Card

Made of acrylic material, transparent and more fashion
Easy to install, for ATX motherbard.
Open delivers better performance on cooling, compatibility and maintenance
Convenient for testing, overclocking or gaming; Support longer graphic card
This case has enough space for any big sized parts needed for the high performance PC