The Arca Swiss reflex I am overhauling now is as close to this as I have seen. It has a plastic/composite frame with aluminum/steel panels bolted on, some die-cast parts, and lightweight fabric shutter curtains.
No need for exposure/readout, that's easy to do without. Prism finder would be ideal but add a lot of weight to get full coverage. the L-R reversal is annoying but at least it's rightside up, indeed.
Price-wise it would have to be something like $5k given the low quantity/high complexity. Even a nicely overhauled working Graflex RB SuperD with a Graflok back conversion will easily bring $1500-2k.
The Arca has a really compact set of rollerblind shutter curtains and a nice, all-mechanical shutter geartrain system that does up to 1/500th and down to something like 1/2 second. I'll post pics sometime when I make a rebuild thread for it in the DIY area.
And yes, a 2-piece or folding mirror of some type would be necessary to get shorter than about 150mm lenses. I was thinking some sort of 2-piece mirror with a hinge in the middle that folds backwards somehow could make it work (short lenses clearing the mirror)
-Ed
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