The great attraction of Minories, to me at least, is the sweeping station throat, which gives a air of complexity, without the complex, and avoids reverse curves through small radius point work. Unfortunately the throat, using off the shelf point work, does use up a lot of space. Doing a quick 5min job on AnyRail for your 12x1 space does suggest it is doable for your modern loco plus 3, but only if you have a traverser fiddle yard.
If you want a Scottish theme, you can do a 5 platform Queen Street in the same space and gain a bit on platform and fiddle yard lengths and save the cost of one point, with the crossovers being located in the tunnel trains enter/leave the tunnel on either line in real life.
It would be cramped in the space, but a few extra inches on the width could make for a nice layout, alternatively you could also keep the extra platform/train lengths for a pointed fiddle yard which would perhaps be easier for solo operation etc.
I personally have no problem with the bottom platform being no more than a platform edge, as it helps protect stock from being knocked off the layout when the track is so close to the edge, but many folk would prefer a real rather than a imaginary platform!
Anyway, I hope these sketches help feed the creative juices!
Angus