
The 2011 maps were drawn in a law firm's "map room" and Republican legislators had to sign a confidentiality agreement before they could see their own districts
All of this is in the court record from the lawsuits.
Draft maps had names like "Joe's Basemap Assertive" and "Tad Aggressive."
There was a spreadsheet called "Tale of the Tape" with a list of "GOP Donors to the Team." Not money. It meant Republicans in safe seats who gave up some of their voters to help other districts.
One state senator sent this in: "If you need a way to take the Staskunas seat, put a little bit of my Senate seat into New Berlin (2–3 wards could make that a GOP Assembly seat)."
They tested the final map before passing it and it kept a majority with 48% of the vote. Next election Republicans got 48.6% and 60 of 99 seats. In 2018 Evers won the state and carried 36 of the 99 Assembly districts.
The staff testified it wasn't about partisan advantage. The judges called that "almost laughable."
https://www.callthemap.com/news/the-house-always-wins#passage-3