Thanks all for the comments

Yes, I did consider a matched pair of staircases either side of the dais. Would have looked nice and symmetrical... But first, I didn't want to cover up all that nice lower level detail on the front of the building, and second - and more importantly - I reminded myself this is a brute defensive strongpoint, not a cricket pavilion. One way in, one way out. In the event of imminent attack, a few minutes work with a sledgehammer to knock away the cairn of stone supporting the corner of rudimentary stairway, and Bob's your uncle.
As far as balustrades and banisters go, as mentioned, I didn't want it to look too cluttered or indeed too sophisticated. And there's also the practical consideration of cutting down on the space for figures on 25mm round bases with too much timberwork in the way...
Anyway, all very good suggestions, but please let me assure you it wasn't because I hadn't considered all the options that I chose not to make it that way

(That said, I definitely hadn't considered wooden hoardings over murder holes, Frank. That is indeed a VERY good idea, and I might just incorporate those... Thank you).
Hopefully I'll have time tomorrow to apply greenery, and then you can judge the finished product
