My suggestion would be to get a box 100 by 50 by 50 cm and put in the frame askew (right term?)..Pythagoras says that's 70cm, plenty of room for the frame..
I was worried about that too. But he seems to sell a good few frames, and didn't mention there being any problem with postage.
I was worried about that too. But he seems to sell a good few frames, and didn't mention there being any problem with postage.