First I'd like to say thank you to all the others who posted above.
Don't know how comparable to it is, but all of the training for my PPL I have done in a C152; don't think a cockpit can get too much smaller than that.
The T-45 cockpit is tiny and the Hornet cockpit isn't much bigger. There are dudes who simply don't fit in either of them and therefore can't fly them. You have to remember what tactical jet airplanes are designed for (Hint: It isn't creature comforts). Imagine being in a drysuit and 40lbs of gear, strapped into the drivers seat of a small British car (like an old MG) that you had to climb a ladder to get into. If you want a comfy cockpit and the ability to eat a hot meal and drop a deuce you're better off going AF.