Jim,
Have you considered using adhesive backed vinyl? I used it on my 80" Balsa USA E III Eindecker and it works great. It's flexable and easy to work with. I covered the E III with fabric (of course) and if I need to remove it, it comes off without damage to the covering. You can get the stuff at a sign shop as thats what they make lettering for signs with. Just a suggestion.
Regards,
Steve