I like to have different HD CF configurations, so I did a lateral slot for it on the Amiga. By now I "only" have 3, but all of them run under OS3.9:
-32Gb Transcend CF running Sys4Aga with OS3.9 BB4
-16Gb Sandisk CF running an Amikit conversion BB2 (lot of problems without graphic card, lots of things I like)
-16Gb Sandisk CF running ClassicWb OS39. Really nice
I have just thought now about the P96 ClassicWB. It looks great to be with Wb 3.1. Perhaps I will install it in a 4Gb Sandisk CF I've got, if it doesn't have support for big HD...