Actually, most countries. Three regiments (or brigades, like the British used) each with three infantry battalions. Two artillery battalions (HoI4, that is, with 72 guns, equalling SIX real-life artillery battalions), one A/A battalion and one AT battalion. The two latter would vary between countries, and could be support units instead.
There's it. Apparently battalions are not equal...
By the same Token, an infantry battalion isn't an infantry battalion, because 100 infantry equipment is a company...
Not to criticize you for your proposed design (it's a wonky Design choice by devs) but the "27w" proponents argued with organization as prime criterium for historical templates, but that flies to the wind if said criterium would make 27w void, apparently.
Then, despite you counting gun tubes, the 36 AT guns in German infantry brigades are suddenly "abstracted". This is not consistent.
Not that I would call you out for that, for what it's worth I cannot get a historical Layout with correct equipment out of this moronic system either, but I cannot gez behind that proposal either.