It's no use pretending I spend hours at a time in the loft in the winter. If there's any sun it's warm enough to spend some time there and milder days are ok anyway. I have now crossed to the second arm of the layout where I'm planning the most complex track laying I will have to do. It's a through station with 2 island platforms and a central relief line - 5 tracks in all.

As it's a through station I don't need to create access from all lines to all platforms - it's basically 2 split lines one each way with the relief line allowing trains to pass in either direction, more or less. The platforms are straight with tapers at each end and what is exercising the brain at the moment is how to ensure that I can maintain the tracks parallel so that the platform sections can be rectangular and pre-assembled without creating gauging troubles. Not just interference by stock on the platform edges but the opposite when too much clearance is built in. 

True there won't be sight lines for that but I will know.

The pics show the track roughly pinned in place. There are 2 tracks at the rear that should be elevated so don't need to be clearly parallel to the lower track. 

The other problem is that the roof trusses aren't uniform so the whole space is more of a parallelogram than a rectangle making it hard to line stuff up.

But my layout building has improved a lot so I feel more confident. Things like point motors slot in perfectly first time now. 

I'll have to add the pictures later - the software won't behave at the moment@