Wow, that is a great link Cifex, looks like a cool forum also.
I am a member of the splitboard forum also and the more I think about it, the more I lean towards buying a factory split from Prior or another brand.
I have tried split boarding on a friend's DIY forum and it serves him well. I donated my old bindings to it and we went out a few weeks ago in the vermont backcountry.
I think the factory split will have the right stiffness and I read into the epoxy and cutting issues around the web also which made me think that cutting a ride kink would be a bad choice because it has too much pop and isn't correct for this. I have 3 boards and don't want to cut them lol.
I also see that sparks bindings work exceptionally well with voile and others. Most of all, I have to think of how many times a year I can use the split along with how many trips I'll make out west with it and etc....it's my newest 'thing' to get into right now lol.