I also have a XA, which is awesome, and a Petri Color 35, which is also awesome, in a slightly different way.
I wish the Petri was a rangefinder, which it looks like it should be, but the extra viewfinder window is just for the bright lines... but it takes a regular flash on the top of the camera (see that, Rollei?)
They're both about the same size, though a bit thicker than the Chinon since they don't have retractable lenses.
The Petri is about 4 1/8" wide (because of the strap lug) 2" thick and 2 5/8" tall.
The XA is about 4 1/8" wide, 1 1/2" deep, and 2 5/8" tall.
I've bid on Bellamis a couple of times, but never been after one hard enough to win
I've always been a little worried about the reliability of the doors and lens extension mechanism.
-Eric