They come in 102" (8.5) and 96" (8) wide. Most built in the last 10 years are 102". My 102 has a door opening of 94".

Nigel had a custom wider one built by Pace so a 8.5' cat will fit inside flat.

You could tilt one cat a little and get it inside a 102 without any problem. The main issue is getting them in and out. Sort of awkward without several people. With a group going together, that isn't a problem.