waiting for clarification on this information, but it is possible the states will be run on the old rules for body scruitneering, except for the front window, which will no longer be ( 50% of front screen) it will be 60mm maximum measured from any point. so a circle would be best

The old rule of either front window (50% = now 60mm)
and roof hole for fuel (50mm)
will still apply
or one 50mm hole disecting both roof and window only.
with the same rules for glow plug hole
allowing removal of front side windows and rear window cuts as previous years. but wait for more clarification from people more in the know.
so your pre cut and painted shells might not be illegal now.