I like it to so I copied it to my computer and looking at the instructions (no I can't read it either but) it clearly shows the space between the points of the tiny squares is 15 centimeters and the over all length to be 52 centimeters.
So I converted those two numbers and you come up with 5 29/32" which would round out to just under 6" for the larger squares and the over all length is 20 15/32" which would be roughly 20 1/2".
so with these measurements and a copy of their drawing for the snowmen it should be easy to make one.
If you start with 6" main blocks (6 1/2 unfinished) that would give you 18" and since the height is 20 1/2" that leaves you with 2 1/2" (3" unfinished) for the small squares. If you cut the corners of the larger squares off to match the smaller ones, I think this would work out just fine.
I think this one will go on my bucket list for the grand kids next year.