I think that it's totally reasonable. The biggest hurdle is when people have to learn as they go. Sounds like you know what you are doing. Shouldn't be that tough and I bet it won't even take you 100-120 hours when it's all said and done.
I'm just east of St. Paul and I've done this job. I'm not volunteering to help (it's a job that you only want to do once) but if you run into any questions, let me know.
I think the biggest time delays are waiting for supplies. For some reason, even though we're in the middle of "lake country," there isn't a great marine parts supplier in the area. Or at least not one that I've found. You may have better luck on the west side.
Former owner of a 1987 Supra Saltare. Current owner of a Malibu 23LSV.