Pardon the question, but what do you mean abou the base not diassembling?
Once you remove the column from the base of a D138, it's only a couple inches tall by (roughly) 2ft x 2ft, unless you're talking about the base-board assembly, and in that case, there is no good solution. Still, the whole thing could be packed into a 3ft x 3ft by 2ft space (as it is in my office), when broken down.
I finally got my scavenged one disassembled, and figured which screws, etc, need to be replaced.
That being said, once assembled, it is large, but broken into sections, it's actually not that heavy to move. If you've ever carried firewood for the stove, or thrown hay bales, the Durst is a piker.