Once all the sheets of ply are installed (leaving one out of the middle for access) I'll give it another coat of undercoat with a roller to provide a nice white surface, ready for the topcoat of green. Before that though I'll be installing the first oval of track, taking advantage of the white paint to draw the simple trackplan onto the surface.
I'm looking forward very much to laying the track! And having a really good clean-up, as with all the sanding required the whole space has become very dusty, not something I take kindly to!