In case anyone is interested you can get it from here
If you find anything of interest, please post it here as I always like to learn new stuff. I searched a bit and here is the most interesting thing I could find:
I've seen various Chicago Beta 1 to Windows 95 Beta 2 pictures before, but it struck me a bit odd that the close button is new but the minimize/maximize buttons are old and from 3.x.
Hope this guide is useful!
Offtopic Comment
BTW, has anyone managed to track down the beta 2 guide? Empireum had it but sadly, the link was on rapidshare and they removed the link due to inactivity, plus he is no longer active on this forum.