I am thinking the same thing. The only two unknowns would be the height and width of the user-facing end of the buttons. It looks like the height might be the same as the stem part, but I couldn't find any really high quality pictures to tell. The width is definitely something we'll want to measure too. I would think the depth would be the same as the Q700 buttons, since the logic board dimensions and mounting relative to the case are (as far as i know..?) exactly the same between the Q700 and the IIci. I can bang out something quick and dirty if you want, but I would much prefer to get at least those two measurements before having anyone potentially waste time printing one.
Finally had a chance to take some measurements (I can't find my metric slide rule so I had to go with 1/16s)
Looks like each rectangular button is 13/16" (.8125" or 20.6 mm)
There is a gap of 2/16" (0.125" or 3.2 mm)
So, unless I have fat fingers, that means an outer width (end to end) of 1.75 in (44.45 mm). Eyeballing your drawings, we're in the ballpark.