just so you know... if you remove that mask (nevermind putting a different one in with a bigger hole), nothing really changes. No extra view... I'm pretty sure. I took that mask off and kept it off because, well, umm, weight reduction.
edit: I see it says that the other aperture frame allows you "to see 20% more". Well, with my glasses on I still couldn't see outside the 35 frames (before I dropped and blacked out the finder, that is)
I made my flexiclamps out of plexiglass (and the one for the rewind post out of metal-- that one's the trickiest); not too hard to do if you've got a dremel tool.