I'm not sure I agree. I always thought the floor and the shell worked in unison. Without sections of flooring, couldn't the shell shift? Even slightly? I always see folks build these supports when working in this manner which I thought was specifically to keep the shell from flexing.
From the pics, unless I am looking at it wrong, you have at least 25% of one end of flooring gone and about 10% of the other end. If the remaining floor is not in good shape....... but I guess if you went REALLY slow and didn't hit any major bumps, dips, etc....
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91