dingy for a ten year old to SAIL

I'm planinng a dingy to teach my daughter to sail. Shell out of two sheets marine plywood etc. deck on bow and pilot seat aft sort of low, to duck the boom. Eight foot long, four foot wide.

Will have oars to row backwards like if she gets in a tight spot at the end of a lake,(or decides to go berry picking at the end of the lake).

Question is placement of mast and dagger board.

Oh yeah. this will have rigging for a jib sail, perhaps cleated to one side or tha other of a two foot wide bow, (decked).

Any input here is good. As the plan is now, mast at two and a half feet from bow and dagger board three inch toward bow from center.

Will post pics of plan next week.