My new Fiction II story

My next story in Fiction II will be about time travel. It will feature a seventh grader named Douglas Hewitt who remains obsessed with the movie Back to the Future. [Yes, I realize I have also expressed a strong inclination toward both time travel and BTTF, but you write what you know, right?]

Anyways, he's ridiculed at his junior high because he's not the coolest kid. He's smart and kinda akward, and the kids nicknamed him "Doogie Howser, M.D.," because of said intelligence and the unfortunate initials bestowed upon him by his now divorced parents. His classmates then shifted it to "Doogie," to make it flow a bit quicker, then truncated it further to just "Doog."

So he comes up with this idea for a time travel watch. On it is his life clock in YEARS:MONTHS:DAYS:HOURS:MINUTES:SECONDS:OLYMPIC MICROSECONDS. The knob on the right side turns the watch backwards, causing him to go back in time in his own life. He can't go forward, only backward. With this watch, he can venture back in his own life and alter himself enough to avoid ridicule. Go back and make himself cool, like Marty McFly.

The only thing is, though he's smart, he's not nearly smart enough to invent such a contraption. He then resides in the concept of this thing, flashing back to points in his life he'd like to change. The story here must become very cerebral. I'm just usure how to trigger these flashbacks.

I'm thinking he should:
1. buy a digital watch from a dept. store in the vein of what he would consider his watch to look like.
2. Sort through photos in his room, flashback that way
3. Read through old diaries
4. Pass out in his bed and have it as a dream sequence where the watch is real in his dream

Then the next day at school, he wears this nerdy digital watch in gym class, and in the locker room, someone breaks it, and he decides to stop dwelling on the past.

Or, he never comes to terms with the present, overanalyzing every little thing he does, thinking he can go back and change it.

I'd appreciate any input on any aspect of this story. Thanks