Which other manuscript contain the most Voynichese glyphs?

[MarcoP]

Given our current knowledge, can we best describe Voynichese script as a mix of 15th century abbreviations and ligatures on the one hand and habits from legal writing on the other?

And if so, might it be a good forum task to collect some more legal documents and try to get a better view on the evolution and geographical distribution of relevant scripts?

I am not sure there is an influence of legal scripts in particular. I also believe that digging into the evolution of scripts is best done with a good book (I have a couple of titles I want to check).
What I liked of the (soon forgotten) original idea of this thread was looking for a single source with as many matching glyphs as possible. We know it will not be 100%, but I believe it is a worthy hunt. As you pointed out, the best parallels that have been mentioned appear to be later than the VMS: finding something similar but earlier would certainly be another small step forward.