Cheggers, good that you are planning real life into your training. An idea I picked up last year was to give Fink a go for a couple of weeks as a 'trial' before then plan was due to start.
This allowed me to tweak sessions around and find how best to plan trainng around my other commitments.
Don't worry about holidays, especially if you can fit then around your 'easy' 4th week. I think the periodisation piece is important so if you can build to a big week before an easy week then it work, and you will ski like a god from the extra fitness.