Cloud letters - Any pointers?

For a client i need to do several words where each letter is supposed to be looking like its made out of clouds - see attached example i stole of the internet.
Any pointers how to tackle this? I did some tests using the Volumetric Material inside a simple box and the results were pretty underwhelming and was rendering for ages. Tried some noisse or smoke maps as a Absorption map but it was far away from getting those nice rough uneven edges and depth of the example. Any ideas or examples?

This example doesn’t even looks like true volumetrics. I think it’s a bunch of cards with opacity texture. Maybe you should try to do the same?


A quickie w/ Blender, VDB in Corona4D.

'tis any good?

Yup, that was my plan too if i couldnt get it too work with the volumetic material. Just wanted to know if i am missing something or doing it wrong.

@burnin, might work, i will have a look at it, thx guys!