I didn't want to thread creep on chucks build so I just started a new one.
Troy you are right about going into Canada. This is from the EAA:
Registration Marks
The six inch fuselage or tail numbers and 20 inch under wing numbers on Canadian aircraft are acceptable in the US. US aircraft having smaller 2" to 3" numbers must temporarily affix 12" numbers when entering any ADIZ or DEWIZ, but 2-3" numbers are acceptable for crossing the Canadian border. Check your chart to determine if you will penetrate an ADIZ or DEWIZ during your flight.
I thought you crossed an ADIZ anytime you come into US airspace?? Has anyone gone from the lower 48 trough Canada to Alaska with 3" numbers?