I don't know about 2 or 3 more. But in front of your stairs there is at least room for one more cupboard, as I figure you probably know (
but said nothing about it). Ergo: A plain "Yes" answer.
demetharkey wrote:this is not the only layout that gives 40
40 ??? ... Your/that setup already contains 44 cupboards. ... 45 if you don't mind losing the space in front of the stairs. (
if that will not block the usage of the stairs that is ... not sure)