slight oops!
looking at this section of drawing there has been one little mistake made in assembly
the numbers that are marked on the custom panels of the facets (for identification during assembly) are supposed to be facing outwards (the back face of the formwork) when put together. however it was decided for mainly aesthetic reasons (there was a sneaking suspicion that the 50:50 choice would come out wrong) to put the numbers on the casting face of the formwork.
which can be resolved in a few ways....
1. rebuild every facet assembled the other way round... ie put the backing support struts on the other side
2. deal with the matter and have the cast inside-out model and have the formwork semi attached
3. deal with the matter and have the cast inside-out model and then reassemble the formwork the right way, so that the numbered face is on the outside and not the inside which (as 3.a) could potentially be poured the right way, however this will leave the supporting struts buried in the plaster, no doubt destroying the face of the plaster when the face pieces are removed.
so in all option 3 seems to be the one to aim for, a little wrong. but still good. will still do the intended job.

drawing detail
numbered specials on casting face potentially printing onto cast plaster (in negative)

supporting struts on the unnumbered side (currently assembled)
move the supporting struts to the opposite face (essentially requiring all the assembled pieces to be reassembled (option 1))

it seems to me 1 is the option to aim for. But am not exactly understanding what you are proposing with options 2 or 3.
will have to come in for morning tutorial so we can figure it out asap.
thanks. n