I just picked up a epi nr thunderbird at local pawn shop, came with a coffin case. alittle tite but it fits good and don't move. If your bachbirds are the same size as mine they should fit fine.
I'm jealous!!! There have been two of those on eBay this past year, both burst with pearloid pickguards and I've not managed to get either. One was on there twice and went for $250 the first time and $500 the second. The third one topped out at over $600!
On a different note, I got a brand new Epiphone bass case from a guy on eBay and that SOB is freakin' HUGE! The inside length is about 52-53" and the body cavity is large enough so that the BaCHbird actually slides around in it. The thing only cost me $79 including shipping.
The BaCHbird saga is a great read, Kenny! I periodically go back through it and send it to people.