To make the connection I would just run the wire along the vent line, under the insulation. Ensure it is very well insulated. Since the motor is on the roof I would insulate that as much as I can from the inside, perhaps "great stuff" sprayed in layers around where the pipe exits through the plywood and tape/staple the pipe insulation on the top of the roof as well (don't use too long of staples!) You don't want any of that heat getting into the attic or you'll get condensation issues. It's a neat concept though since the fan can be easily serviced by going on the roof. Beats going in the attic, like you would if it was an inline fan.
As for the timers, I have the 2nd one you posted, and it works nice. I installed an inline fan a year or so ago along with it. My setup is a bit more complex... the fan is actually in the basement and pulls air from the upstairs bathroom, long run. You will enjoy the quietness of this fan.
As for the timers, I have the 2nd one you posted, and it works nice. I installed an inline fan a year or so ago along with it. My setup is a bit more complex... the fan is actually in the basement and pulls air from the upstairs bathroom, long run. You will enjoy the quietness of this fan.