Our foamboard dimensions here in switzerland are 50x70cm or 100x70cm and 140x100cm.
The original plans are oke, but we wasting a lot foamboard at the first self cutting plane.
I modified the plan for our Need (Pusher Version), my plan size is 100x70cm. So it fit perfect for 1 plane.
The foam spar holes are only a 50% score cut cause i pulled out the foam from the inner side, then we have not the 2 holes on the underside of the plane. I also mark the Balancepoints blue, we just mark them on the plane with a small dot or a neddle.