Firstly, gather materials up(no glue needed):
2.three or more CDs
Step 1: Cut the slices
Use a bow saw to cut all the cds with proper size and two grooves on the base cd for mount ribs.
Step 2: Assembling
Warning: During this process might emit toxic gas.
Step 3: Done & tests.
These transparent disks are made of CD-ROM by filing it's back layers.