I think the photos do a pretty good job explaining things, but I'm happy to answer questions if you have any.
It's nice if you have an EX1 and a Z-Finder handy, and it does make it easier to focus with the EX1's flip out viewfinder. It doesn't cover the entire viewable area when flush-mounted, but you do get all of the 16x9 safe-areas. If there was a way to fashion a spacer to float the Z-Finder a few millimeters above the viewfinder it would be quite easy to include the entire screen area.
I had forgotten that you can remove the shoe mount on the EX1R (Possibly the EX1, which I don't have) to reveal a threaded 1'4" receiver. This made it a snap to mount my NOGA arm and feels sturdier than using the shoe mount.
I'm not suggesting that you go out and buy the items to do this. I imagine there are better options available - I just haven't tried them. But if you happen to have the parts handy, then you might find it useful for checking focus. It's not as comfortable as using the EX3, but it will do until I can afford the Zacuto EVF.
That's pretty cool and it seems to work! Call this the EX2... half EX1 and half EX3! Anyway, I'm wondering if you could take a piece of clear plexiglass and use that as a spacer to get the viewfinder farther away from the screen? You can mask the edges off with black tape. I've been considering doing this myself, but haven't gotten around to doing it. I shoot freelance for a local tv station in Philly and they have an EX3... I've already broken off the viewfinder eyepiece (poorly constructed on the EX3) and the rubber eye cup is always coming off, so I have to retrace my steps looking for it!