Interesting concept for a lightweight camera, you sport technical creativity in that design !!!
Anyway IMHO it would be interesting to include a sort of fine adjustment (little threaded studs somewhere perhaps) to ensure critical GG to film plane, as Bob points from the Linhof design.
When the lens if well stopped then plane matching is less critical, but for shots at large aperture it's another thing. I think that Depth to Film Surface for 8x10 holders is 0.260" +/- 0.016", this is 0.4mm tolerance from the intended plane, but any missmatch you allow will add to the natural variability of holders, that I guess usually it's lower that the max specified.
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