If you haven't bought it already, don't hesitate to do it.  CS has done a great job with this one. Remember, it was the 707 that ushered in the jet age and changed the world in which we now take for granted. So you'll be participating in a piece of world history.  To get it right the work load is a hand full and takes time and effort to learn,  buts its the process of learning it all is what makes it fun for me. And the learning never seems to stop.  All the fellow 707 enthusiasts in the forum are very helpful.