yeah that sounds interesting... After carting around change
bags, paper envelopes for unexposed and exposed 'negs' and
having to sit down on the ground to make a neg change (and thats
only with a 5x7 camera) I can see your multi-shot design would
make life easier and more productive!  your 'roll film' camera
is a little like my 1st pinhole... I jammed a 35mm canister into
a 100 sheet box of Ilford Ilfospeed (4x5" size... probably tells
you how long ago this was.. mid 80's) so that the reel the film
winds onto poked out of the box and I could wind it on. Wasn't
as smart as yours to be able to tell how far to wind the film on
for the next exposure! Several exposures ran into each other!
Also, I didn't know anything about sharp pinholes and using
tinfoil, etc.. I just poked a hole in the opposing side of the
cardboard box! The pictures were primative!  My 5x7 pinhole
(which I call A Nigon B57) is made out of some kind of particle
board and consists of 3 boxes that fit inside each other. The
middle box points the