Willie,
#10 wood screws would work fine. Your method is also good....t-nuts and 1/4-20 bolts. One other thing.....if you ever plan on doing anything with green wood, you need to coat the inside of the blower housing with urethane to protect it from moisture. I don't think it would be good to glue the blower, but silicone would be good. Silicone could be removed without distroying everything incase you ever want to take it apart.
Nice picture!
