Oh no oh no. Hahaha. I'm working on one of these as well!
We are quite similar aren't we?
Actually mine is just going to be a pack film camera, one 4x5 rangefinder is enough and I quite like the design of the packfilm back already.
I'm a little curious why you didn't choose one of the models with the Zeiss rangefinder - I picked one up about a month ago for $15 and I've been modifying it.
Also curious how you're going to alter the rangefinder to work with the 127mm. As you probably know, it's set up for 114mm. I'm trying to find a 114mm Tominon in a Copal Press shutter but unfortunately it's not easy, they are rare.