I'm still 'pottering' on the puzzle Don.
At the moment it is the boringish bits, rail painting and ballasting. Having said that, after an intense day at work, if I stick some music on, it can be quite therapeutic. I should be able to move onto constructing some buildings soon.
For something that was supposed to be a 'quick fix' it is becoming quite time consuming - but I'm enjoying it, which is the whole point after all.