Managed to get on a tablet CG let me explain. The scale of your goods shed is bang on, they were enormous compared to their station brethren and i think you've captured it wonderfully. The problem is that the station building is one of the lowest on the network and makes the shed seem out of scale, when its not! If you can cut out the mdf section of platform and drop down the building, it will work. I think ballybrophy has something similar.
I know it's a hoor cutting wills sheet, but you should only have to do it on the entry/exit arches, and these generally have about a 4mm clearance from the top of steam locos cabs to the arch, so i hope its not a chore too much. A couple of pieces of scored balsa wood to represent sliding doors over the 3 opes would finish it off nicely.
Btw, the two six wheelers with cattle wagon and goods van behind scene is superb. This has great potential to be a "timeless" layout. Richie