Just chiming in, as I didn't post when I received it due to travel/work.
I picked up the HHKB/60% case and my Poker fits beautifully inside.  Not too tight that it would cause pressure to keys/etc..., but tight enough that it doesn't bounce around inside.  I'll have an HHKB this weekend to test drive in the case, too.  Don't expect differing results.
TBH - the case is better than I was expecting, kudos to intelli (and the artisan).  And dealing with intelli for the purchase/shipping was a breeze.  If you're on the fence - lean towards picking up one of these cases.  I'm much less concerned with my flights now that I have a case for my boards.