I too would be interested in hearing how this goes.
I recently had my DS410 die after having water get into the bottom of it =( it was going solid up until then, but certainly showing its age in terms of streaming and well, I wanted to try out some dev packages as well.
I was hanging out to see what the DS920+ looked like before getting either it or the DS918+ at discount.
Not having my NAS for a few weeks has been painful so I was hoping I could try and boot them on an Old PC and see how that goes.