I just made some nice looking fiberglass covers for mine using 8 oz disposable food containers as plugs. The kind you get at the deli for stuff. Someone does make and sell them though.
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020