The 7400 stand dimensions are for the height of the stand's top surface. I couldn't find anything on the width of the stand, but it is clearly more than the saw's width. However, the saw is stored on its side, so the total floor area it occupies when folded up is pretty small. The width of the stand appears to be about 1.5 times the width of the saw.
The legs splay out, and I couldn't find any measurement on that. To get the floor dimensions of the legs, you are correct, someone with the saw and stand will have to measure for you.
The area a table saw requires is always going to be determined by about double the length of the workpieces you are cutting with it.
The more I do, the less I accomplish.