I bought Xpanel a few years ago to plan the panel for my RV-7.
Each time I had a question or needed support Scott has always responded very quickly and gave very good support for his software.
I really recommend Xpanel if you want to play building panel layouts for your Vans.
I'm now wiring my panel and used I used Xpanel to lay out all my instruments, added instruments that were not included in the database, exported the panel in a drawing software to add labels and it really worked great...
Image from Xpanel:
Image after editing in a free drawing software (paint.net):
Alain.