Like I mentioned, based on scaling up from the height of Bandai 1/144 AT-AT, as well as scaling from a 22.5 meter tall AT-AT, the Revell AT-AT is pretty spot on for 1/72
Of course the problem is the ridiculous price people are asking for one. At one point I think Revell of Germany re-released it, but it is out of production again
Still if you are patient you can occasionally come across a reasonably priced one. Often Revell labels it as 1/53 scale, but that is not accurate (like many of their other listed scales for Star Wars stuff)
It was around $40 to $50 but sometimes drop as low as $30 when it was available
Unfortunately, this is about as cheap as I've seen it
https://www.bonanza.com/listings/Ro...MIzePuobCT3AIVwSFpCh38XQN7EAQYAiABEgIEtfD_BwE
It needs some TLC to turn it into a good replica, most notable, it is missing the armor plating on the sides of the head, but you are more than capable of fixing that.
I did it for mine, but it wasn't too hard
Note, those are 1/48 figures. I was posing them with it since someone was interested how the Star Wars Legion or 1/48 stuff looked with it. I think it helps show it looks too small for 1/53
https://farm1.staticflickr.com/890/42474671001_9879d29e4f_c.jpg
https://farm2.staticflickr.com/1746/42424321812_f2a02d5e3b_c.jpg
It looks more appropriate with other 1/72 scale stuff
https://farm1.staticflickr.com/890/42424336472_0b4e8892a0_c.jpg