Steve:
Something's not right here.........
200 amp rated panel? Using as a sub-panel; OK!....with 125 amp feeder?? (as you said)
Why the 200 amp "main"????
Without reading the label on the Siemens panel you installed, and based on the cover in the photos......Something's not right!!
Either:
You have wrong 'Main', that you don't need.
You have wrong cover.
You have wrong panel.
"MLO" panel or "convertable" panels usually DO NOT come with the KO out for the 'Main'
As stated above by others, for a repair type job, a butchered cover MAY be acceptable, but on a 'NEW' panel install, NOT Acceptable.
John
