From what I can gather, the lively discussion concerning recreating this weapon jumped the rails a bit.  Usually, when threads jump the rails, I am at fault.   Happily, I was not part of this community then so I can appear pure on this issue.  While ballistics and levels of safety of of great interest to me, I seems that the basic design that was tested met basic safety parameters.  That said, let me identify what I would look for in obtaining a reproduction of this weapon.
1) That it is reasonably historically accurate in apperance.  As I recall the original was some sort of cast brass or bronze which while nice in a reproduction is not really necessary.  Machined steel is just fine.
Ulrich whoosieface has provided us with an example of what it should look like:

And it's dimensions:

A compromise on the funky powder chamber is quite acceptable to me.
2) That it is reasonably safe to shoot.  I can really see no way that this would become a preferred firearm.  I suspect that I would shoot it a couple of times for the heck of it but that it would be more on the order of an interesting model of an otherwise unattainable ancient firearm.
3) Price ... I would hope that getting a number of interesting parties together to make a purchase would result in a reasonable cost.  I am not sure of what that is just yet but am open.
So;  all that said, can we re-animate the discussion of making this cutting edge 14th c. weapon available once again?