Hey guys,
Quickly cut myself a set of stickers today, really happy with the way they have come out. Not aligned perfectly but that's mainly because I was rushing. I have added alignment tabs to the cut file now so that alignment on future stickers should be close to perfect.
Sizes I have come up with so far:

300x144mm (size of the ones in the photo) ($16 a pair)
150x72 (should be good for on your planes)($12 a pair)
600x 288 (BIG ones, could be good for trailers) ($50 a pair)
This is just to make it easier, but I can cut the stickers absolutely any size anybody wants.
Cheers, Chris B.