I do understand that a small part that had 1m3 now can have 1L. Still that's 0.001 m3 so there was a problem there only because you do not allow sub-unity amounts. Still, a liter is a more practical unit anyway. We'll only be able to fully understand the impact of this change once we are able to try r15.
Also, along the lines of what Daphne Jones said, fuel weight going up with fuel usage going down sounds good but don't make it go up in a unrealistic way. 1l of fuel should still be less than 1kg i.e. keep it below water density.
Inventory going down to 4000L (4 m3) will still be great for small parts but has the potential of being catastrophic for big parts. I do have noticed that you stated that small stuff will get a bit bigger and big stuff will get a bit smaller. So no real way to anticipate the impact of the change until we try r15.
All in all you clearly provide the tools for greater granularity which will make future adjustments not only easy but also possible.
On paper this all looks like good news. We'll all be there to give you the feedback on how everything works out!
Good job, NQ