I just bolted down the two horizontal clamps, identical to those used for the QX.
It might be possible to get an idea of the length of the reactor body by comparing the handle angles, distance apart, etc., from the demo photos.
It is clear that the clamp rods are very nearly fully extended. And rusty. The bolt head, just beyond the more clean cinch nut at the end of the rod looks really rusty.
Edit: It is also clear that the clamps are not precision made... one has a 5 mm longer rod than the other. Also I had to shim up the RH clamp so that the rods would meet at the same height.