Laser cut the latest design modifications. The guide now has the braces moved to the front and includes a panel that will support the grabber wheel (to move paper into the shredder). Currently using 5mm Acrylic (the blue you see below is the protective wrap). Also learned how to cement acrylic today thanks to a super video made by Tap Plastics.
Here's the final assembly after the protective wrap has been removed and the parts welded together.
Motor (30:1 gear ratio for maximum torque) and Arduino Motor Shield have been ordered. The Shield comes in kit form so I'll be soldering next weekend!