i have read the details and i see that by now you don't have applicants who have already done such system, so if you don't manage to find one, i will happily develop a new one from scratch, including design :)
i do have experience with one-purpose company computers such as this (systems on-board airplanes)(you can see it in my portfolio), so it's not of any problem.
as for the implementation, it will be built using C++ for best stability and Qt for graphical interface.
contact me if you decide, and feel free to ask any details :)