Hello there Dr. R
Those were just a drawing out of my head, following no great design (early 50's and on). Bombadier bodies have changed so little over the years, it would be very difficult to nail down the year of your machine by body style alone. Your best bet would be for you to take a few pictures of the machine, incuding things like door handles, door closures (type of pin), and sent it to Cranman and Ted, between them and the rest of the boys up there, I would bet they would narrow your machine down to within a few years on origin (if not the exact year) As they say, "a picture is worth a thousand words).There is alot of knowledge about these machines up there with that group. Unless you owned the machine from new, it has probably had all kinds of modifications done to it by the various owners over the years. That's what makes it so hard to identify these old machines.
Good luck.