Ok so here is how I did with my Alembic.
First I decieded that I can't carry original case around, so I got myself a gigbag, Gruvgear...
The bass fits perfectly., here are pics.
But, after few gigs I realized that I would like (If roadie, which usually happens) some kind of case/gigbag so want to share this with you.
I visited the company here in Croatia that do cases for instruments out of carbon, they are very light and sturdy. I really didn't think they do bass guitar case, but they do. What's even better they do every case like some people make basses, they do care about their stuff. When I was choosing for mine, you can decide for so many options, from how it will look inside (straps, holders, compartments, etc.) and you can chose how it will look from outside (color, shape, etc.). Btw. it's only 3.5 kg in weight!!!

So they measured my Alembic and started to build the case for it.
Can't tell you how great cases look in real life, just insanely great, that 3D carbon is great I'm gonna post a few pics in next post so you can see how they look like. Just saw that Stanley Clarke has one for his double bass.
Anyhow, the only thing is the price, I know that Alembic are not cheap instruments, so there is a price tag that usually makes people divert from getting one, price for one case is around 1000 euros. So that's why mostly classical player do tend to buy them, because it's not a lot of money if you have an instrument worth over 20.000 dollars, or euros.

you can check them out here
https://www.accordcase.com/You can also find them on Facebook, there is a post that I did how I visited the company.
So now the waiting time to build me the case, as soon as it's done, I'll post the pictures here so you can see how it looks.
Goran