This is not being "just oversized" this is being rediculiously too large.

You have to cut off so much board that it with result in a big hit in aspect ratio. Why do it ?

You'll end up with a pretty mediocre design after the testing and cutting.

If anything start with a 200 mm width and a 1000 mm board instead. That 0.200 sq.mtr is oversized without going overboard and if this has to be cut shorter then you still have asn aspect ratio of at least 4 or heigher (200 mm by 800 mm)

Wouter