On the subject of not starting something else till a job's finished, I started my layout 40 years ago but never finished because I kept starting other things - university, marriage, kids, car restorations, house decorating, 4 house moves etc. I'm finally at a stage where I can carry on with my layout - once I put a ceiling and insulation in the garage
At least I've managed to half complete a few buldings in the intervening years. For the record, my workbench is used for everything and is never tidy.
graeme