I thought free HDD space not to be an issue in BetterWB. The story goes like this:
AmigaOS 3.1 requires about 2.5 MB of HDD space.
BetterWB install on top of the above mentioned 3.1 system, and adds just under 9 MB to it.
I really dont think it is a lot to generate troubles. But certainly, some space can be saved by:
not installing printer drivers -- 0.5 MB (aprox)
removing unused iconsets -- 0.5 MB (aprox)
deleting documentation -- 2.4 MB (aprox)
I dont think it is worth it. But then if you really need that space, I will see what can I do to add an option for tiny space setups, and save a whooping 3.4 MB