Note that I have made a minor change to the Itinerary, to take in the bustitution of the southern portion of the Downeaster route. This is based on the times for the Downeaster train and substitute bus on the e-tickets. The only notable difference is that the bus leaves North Station 5 minutes earlier (11:45 AM) than the train would have.
Also they don't give much time to transfer between bus and train, or train and bus, in Exeter so I assume that the schedules are padded and the first conveyance will arrive in Exeter earlier than noted. There is no way they would be able to offload a train or bus and load the other within 1 or 4 minutes.
I'll try to work on the participant list this week. Please let me know if you're interested in the Friday or Monday Foxboro trips. If we have nobody on one or the other, then I don't have to go twice.