It is crack on the inside(engine area) its hanging on because it didnt crack/snapped completely, so I was thinking about placing some bondo fiberglass kit to it to correct crack and strength it so it dont come apart.

When you fix it with fibreglass drill numerous holes at each side of the crack, then countersink the holes good n deep from the outside ( presuming you're gonna put the fibreglass on the inside) make sure the resin comes through the holes and fills the countersinking on the outside , that'll give you a good strong fix!