"Dieter" = Dieter Doepfer, the grandpa of this Eurorack thing.
The B. 305 has no VCAs at all. It looks fairly feature-packed, but that's because Uli mashed two other 100M modules together to come up with it, then discontinued those two before the 100M stuff came out. However, it's worth noting that all of those gray things of his are copies of the Roland 100M modules, with a different form factor and retooled for Eurorack, with some results turning out better than others. As far as a decent output mixer goes, there's FAR better stuff out there...and definitely more capable stuff, too.
As for the cab size...good, you recognized the problem right off! This 100% needs more space. Have a look at these: https://reverb.com/brand/case-from-lake I've heard several people mentioning that the craftsmanship on these are spot-on, plus if you need to "adjust" a case for more size, amperage, ATA hardware, etc, they can do that. And the prices are KILLER. Also, the amazing thing about Case From Lake is that you can get a portable cab with INSANE amperage figures if that's what you need, as they definitely do that and many, many other optional things.