Runnng Shed doorway

I started to build the Running Shed six years ago and have placed in on and off the layout many times including having Locos in its doorways. In the last few days I've only just noticed how high the doorways are! In looking through my WR Engine Shed books, and especially photos I've taken while visiting Didcot, I'm now seeing this as a problem.

Didcot

It's amazing that I have only just noticed this but how to solve this? It has not helped that I've decided to higher the base of the building my 2 mm so I can install hard standing up to rail hieght within the Running Shed...

It's too late in the construction to reduce the wall height, so I feel my only option is to add more louvres/grilles and then modify the doors to suit. 

I did contemplate cutting out the louvres/grilles from the rear doorways, as these will not be seen, but felt I'd not be able to cut them out without damaging them. So unless I can find some similar louvres its down to drawing some and having them laser cut.

In the meantime I can still continue with building the running shed with completing the roof and offices, installing lights, and also the hard standing within.