OOOOOOOOH! She's lovely, puts mine to shame really I like how you've kept the original focussing system and rangefinder, mines a bit of a nightmare to focus properly.
I presume you have to get a lens of the same focal length to get the focus to work?
Just bought a Polaroid 340 off Ebay so i'll see what its like when it arrives. If its a bit ropey i might mod that too. Got a lovely schneider lens/shutter lying about somewhere!