I purchased the pre-punched panel thinking I would use it. After some decision making I went with the Dynon setup which of course negated being able to use the pre-punched panel. Also, the pre-punched panel bothered me because the 6-pack holes weren't spaced evenly because of the tip-up rib behind the panel.
Anyway...I agree with the Wes that it isn't hard to cut out a panel. Actually I found it to be quite fun. Just borrow an instrument hole punch from your local EAA chapter or someone else and have fun. Just remember to grease up the punch. Don't ask me how I know.
One thing that was nice was that I chopped up the pre-punched panel and used the pre-punched holes as guides for my new panel -- for example I used it as a guide for the altimeter cutout and for the ELT remote cutout. Also, part of the bottom flange is now a part of a friend's tip-up canopy frame. :-)