Some update pictures. I have done several feet of ballasting, and I think I'm happy with the techniques I've adopted. Part of the reason for writing them down here is so I can remember for after any large gap in activity.
So. The ballasting technique. PVA with a dash of washing up liquid in goes on the underlay (Woodland Scenics black stuff with shoulders). PVA goes right to the edge of the shoulders, preferably not onto the board. I tried masking tape, but by the time I got to remove it after the glue had dried it was set solid, so I've taken to scraping the excess off with a chisel. Track goes on that, with ballast (at the moment, Woodlands Scenics fine buff) poured on and tamped with a 2" paint brush. Extra tamping on the shoulders.
Once that is all dry, a muslin square over the hoover pipe collects most of the excess when it's vaccuumed off. A thick layer of PVA on the shoulder again, then it all goes back on again, more carefully, brushed into place. Because it's quite a pale colour, I have taken my 50/50 PVA with a generous dose of Fairy and added a good squirt of black and brown acrylics. The resulting grey goo is generously applied using a 50ml syringe I got from the local pharmacy and left to dry. There is some clearing of ballast to be done from the sleeper tops, but not much. The result is below, ready for application of mank and grot from my selection of colours.
To keep myself going and to break up the big ballasting job (I think there is 180' of track so far I need to do) I have been playing with a rail served industry. I hope it shows in the photos, but the plan is to have access from a trailing turn out off the main line: the mainline loco with reverse the train into the sidings and collect the wagons which are ready to leave. The brewery loco will fetch the appropriate wagons out of the siding and run round using the loop between the sidings and the main line. It will then propel the wagons to the right bit of the site. I was thinking that the brewery loco would be serviced by the boiler house as there will be coal and water there anyway. Fetching wagons out again would be the reverse of getting them in. Just wondering whether there would be enough work to justify keeping a loco in steam at the brewery. Anyway, that's what I was thinking when I planned the layout of the sidings.
Any suggestions of how it ought to be laid out or the arrangements of the buildings or anything that I ought maybe to do differently most appreciated. I may not get round to acknowledging individually, but I am always grateful.