Those look great. And anytime you can use scraps is a plus. Good idea.
P.S. in looking at your picture, it looks like you have added some sort of sanding table to the top of your spindle sander. I have that same sander so I was wondering how well it works to collect the sanding dust. The onboard vac system doesn't do all that well for scavenging the dust. Please, expand on that. What size holes are they and how is it attached, if it is attached. Thanks.