Ok, the Fort William plan is the sort of plan I had in mind. Harlequin, here are the answers- I have the layout in the holiday home because there's no space in our London accommodation. Is it achievable? Yes, as when I go I usually go for at least 5 nights or so. Therefore, I can dedicate whole days to modelling. Either way, I can lay track and get things started in just a few hours. The driving force behind the topic is having had nothing to play with over summer (the MDF being moved around) and of course a passion in railway modelling. I have spoken with the club members, and this is a summary of what they said:
6ft long trains have been enough (this is a branch line, and I wonder if it is enough...)
Sequencing and multiple operators doubles or triples the fun with minimal outlay (help on how to compile a sequence please, and also advice on where I might get additional operators)
Don't build too small (from the N gauge team, where 'big' in their vocabulary is about 15' by 4')
Never build a major mainline (club secretary)