It's generally held that the dimensions of G1 make good sense with respect to the observed ratios. However, this does not apply well to G2 as I’ve described it above. Should this specification be correct then it might be suggested that a height of 272 cubits and a base of 408 cubits would be more in keeping with the design. However, this would suggest a G2 cubit of 528mm.
Nevertheless, the revised dimensions would result in a diagonal of 576 cubits (cos45=17/24) and a corner edge slope of ATN(17/18). These dimensions may thus begin to be more understandably integrated - more so than 274, 411 and 581 cubits.
The internal dimensions of G1 are generally consistent with the external (they use the same cubit.) Similarly, there is evidence within G2 that a cubit of about 528mm is viable, and this seems also to apply to G3. As I've noted before, this would obviously have some impact on the Giza ground plan.