That 6x12 is beautiful! Its obvious you've taken time and care over it, maybe thats the key to the next one i make. Its really nice to be able to make a camera that is completely individual.
I really like the focussing mechanism on the Polaroid rangefinder too, i recon if i do it again i'll attach my lens board to the polaroid mechanism.
currently looking for a hot shoe rangefinder for my current one, at least that'll give me a rough idea for focussing!