I just finished my first case-mod on my A1200, see my blog: Got CF? Sure… Make that a double!
While using this dual CF2IDE card i can insert two CF cards and use them simultaneously ;-)
Sneak preview:

Next case-mod will be installing a HxC 2001 SD Floppy emulator.
Wow, that looks very nice

Are you using 4xIDE or something? I had an issue with 4xIDE and FastATA hanging on cold boot with my CF adapter. It still works, just I always had to ctrl-amiga-amiga after a cold boot. I switched to a "Disk on Module" which does not have that issue...
This is an older picture of my 1200. Its basically the same now but with one more port for eSATA.
I'd love to add dual CF like you have done, but I don't want the cold boot issue to return and I don't want to give up my eSATA.
I emailed elbox about it, but they have not responded yet...