It's really a little more like 4.5x5. There is some extra travel that is masked by the 4x5 back. It could be potentially the same shutter as used by an RB graflex SLR, which would do 5x5 because it's revolving back. In that case, one would have to be a better woodworker than I to get 5x5 out of it.
http://www.f64.nu/photo/tmp/lff/_DSC7351s.JPG http://www.f64.nu/photo/tmp/lff/_DSC7350s.JPG is the speed graphic focal plane shutter setup I use for a ~~4.5" rear element lens.
I don't know if this is close enough to the OP's goals. Another option would be a set of ND filters to allow more exposure flexibility with a guillotine or packard shutter.
If it's a homemade camera and the purpose of the lens is to shoot wide open, you better make it very solid at the front as any flexing will throw it out of focus at such a thin DOF.
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