Yeah, I've been centering them on the disc, and just kinda using my head as a rough guide for the width. I've heard some stuff about the disc being round, but most that I've seen actually aren't. I put together a rough round one before deciding on that shape, and compared it against a rough version of the one I ended up with, and there wasn't enough of a difference to go to the trouble of cutting a 1' perfectly round disc. The rectangle with rounded corners fits a lot better in my mic case, too. Anyway, I know a round disc is the more proper way to do it - but when Jecklin first made his they were covered in lambskin, and I didn't have any of that laying around.
And yes, it sounds great on the headphones!
Still sounds very good on the monitors, but the phones are really great. Similar to a binaural head, but I think I like it better. Cheaper, too!
-Dave