I started my project this past weekend based on Project Arcade & Saint's book. I have a question regarding the base. The base includes 4 support pieces that measure 2 3/8" deep that create a base for the cabinet bottom. Then you are to add 3" wheels to the bottom. It seems that if you add the casters the actual supports aren't supporting anything anymore. It seems that the casters are now what supports the total weight of the cabinet since the wheels are 3" tall and the bottom supports are only 2 3/8. If you use casters, do you need to use the support pieces?