Hard to beat the genuine deal - Anvil cases. In fact, it's probably impossible to physically beat them up in any way - really superior materials and construction. Of course, cost reflects the quality (but are insignicant compared to the cost of your Alembic). I have a Series I Exploiter which came in custom-fitted Anvil, probably the case from the factory. It's super strong, beautifully fitted (the internal compartments are custom fitted for the DS-5 power supply), and ridiculously, insanely heavy. Get wheels. I'm not kidding.
If your bass is relatively standard, then Anvil probably has a form for it already (neck length would be an easy adjustment). They will build a custom case from a tracing as well. There are lots of dealers; shop around for a break on price.
I've had a Calzone flight case (I'm not sure they make instrument cases any more) and the general construction was OK (I believe this was an ATA-approved case, like the Anvil, many flight cases are not approved).
I haven't used one, but I've read that people like the SKB Vault case. This isn't like their hardshell cases, it's actually very similar to golf club flight cases. It's ATA approved as well. It's a super strong plastic clamshell with wheels. You stick your bass in a gigbag, then stick the gigbag in the case. It seems like it might be worth looking into.
For what it's worth, I have a Status bass that came in a Hiscox lite flight case. It's noteworthy. It ain't no Anvil, but definitely a lot more protection than a regular hardshell case. It looks like an Ovation or Martin acoustic plastic hardshell case, but is much stronger. However, the interior is customized, and I'm not sure that anything would exist that would accomodate your Alembic.
Good luck,
David fung
