i found on Ebay the following parts the descriptions should allow you to find them.

2 * Industrial Class 650nm 5mW 5v Red Laser Line Cross Module Glass Lens Focusable $10 (Coming from China or HK)
1 * (2) Acrylic Plexiglass Green Edge Round 3/8" x 8" Diameter Circle Clear NEW (Got 2 disks as i am sure i am going to screw one up when i try to drill it) $20
1 * 16014 New WJB BEARING ($16 + 4 shipping)

I was also thinking that it might be better / easier to use one of these LAZY SUSAN BEARINGS -3 INCH-200 lb MADE IN USA
Cost on that is $5 with free shipping and just some small modifications needed to the layout. I have the parts listed above all on their way so not going to change now but it may make a cheeper base if someone wants to keep prices down. Was also thinking of possibly doing one where the camera turns around the turntable so large things that may not rotate easily could be done.