Here is the way my WM 46 Ultimate looked right after I'd finished assembly.

Sorry I don't have a later picture. But the better design shown can be improved one of two ways. You can most easily run a brace from the top of the front cross member to the top of the rear cross member. Or one of the diagonals could be changed from it's front-top-to-rear-bottom diagonal, to be front-bottom-to-rear-top.

After flying the little sucker a couple of outings, it became apparent that the top wing is under some pretty heavy forces in flight and benefits from having both attachment points to the cabanes (the two bolts through the wing) as rigid as possible. And the rear brace isn't rigid at all front-to-back. The front brace is rigid front-to-back because of the diagonals. The rear can share that rigidity with a simple brace from it to the front brace.