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Let's see here, an 1/6 M4 will end up about a meter in length, quite tall and wide compared to the rest here. I'm guessing a bit less doodads on it since it's a tank.
Dora will be a lot slimmer, but reach about 1,35m.
You can get a B-52 in 1/48. Wingspan should be a bit shy of 1,2m.
1/200 is starting to be a thing for ships. Yes, there's a Yamato to be had. Should end up about 1,28m.
But of the ones I know of I'd probably give the prize to Trumpeter's 1/48 Type VIIC U-boot. 1,4m and a full fucking interior.
Leaving the kit side, I've heard of a guy scratch building a KV-1 in 1/1, but haven't found any pics.