@Cake:
... because that are the proportions of the original maybe, Cake?
Look at the original overview and afterwards on the remake overview.
@Remake:
I think the original looks way better and I don´t say this because there is no scenery on your remake. The colors, the theming ... it´s not unique, not a little bit. Those dirty maps with that texture ... it is getting odd and boring.
As for the layout changes: The tunnel looks like there will be straight barret shots and much spray in there. you can spray with an AK74 or a Minimi from one side to the other. The original bunker was a place where you could also hide from enemies, it was ... a bunker. Your bunker looks more like you´d just want the player to rush through it to be frank.