Hello,
From a Real-Time perspective, the only hardware that would support IMAQ hardware and software under a true real-time operating system would be PXI. A PXI chassis (the smallest would be the PXI-1002 approximately 10" x 8" x 6") with an RT PXI controller and PXI IMAQ board. I'm not sure what the weights are, or what your weight requirements are, but I noticed that you posted your question to the PXI and IMAQ / Vision groups as well, so perhaps you will get more detail there.