Going later so you arrive in the Great Lakes
in June would be best. It would be a great trip. Just note, June tends to be the fog
month, especially on the upper Lakes. But that's better than ice and bitter cold.
Valhalla360 covers all the possible routes well. My understanding is that the Trent Severn Canal's maximum draft
allowance if 5'. If you're deeper than that then you've got to take the Welland Canal to L. Erie. I believe they require at least three crew on the Welland Canal if you're up-bound (down-bound two is the minimum).
As I say, it would be a great trip if you have the time. We're planning a similar trip, but in reverse. Maybe we'll cross paths