Gooday Tassie, I haven't made any of the maps without the white background because the reflective material is extremely difficult to remove without it.
If you'd rather not have the white behind the map, it's simply a matter of running a sharp blade around the coastline and remove the excess white.
That way you still have a backing for the reflective.
The removal problem is due to the reflective breaking into small pieces whan you try to lift it. With the white backing, you get under it with an edge, and the reflective comes off with the white. Easy.
I guess ya spent most of today out in the yard playing with the new toy ?