Dan,
See http://66.49.230.119/booklets/photog...ol_1_31-61.pdf , its down near the bottom.
Neater than the homebrew dicke Berta you bought. The design studies I did for a 2x3 kleine Berta were more like it than yours. Not to say that yours won't do the job, though.
How to make something like the Naturalist that will focus a longer lens should be obvious.
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