What should be the dimensions for a Minecraft American football stadium?

I know the dimensions for an actual American football stadium are 120 yards by 53.5 yards. The first two football fields I've ever made on Minecraft were 120 blocks by 53 blocks, but I feel like that's too small. And I feel like if I did 1 block for every foot (3 blocks for every yard) then it'd be 3 times the size of the fields I've created and that would be WAY too big. So what should the proper dimensions be?