Divine Angel said:

I was wondering how eight people managed to fit inside Integrity yesterday.

Not a terribly accurate image. When NASA had Skylab in orbit they were prepared to send an Apollo CM/CSM with only two crew to rescue the three, in case their CM/CSM was not useable.
They were able to fit another two couches under the usual three.
I found an image of it yesterday but can’t today for some unknown reason.