well the one on the front lip isnt to bad. to strengthen all these areas you can by a diy fibreglass repair kit from autobahn for $28. it an easy way to fibreglass behind all the crack points to harden them up and reduce the amount of movement they have.
front lip crack: easy fix, glass the rear of the bar, then use bog to fill the void on top and sand to smoove. prep for re-spray with primer.
side wheel arch: bit of a harder fix coz by the look of it, the bar has splintered all the way through and is 2 seperate pieces almost. still u glass the back of it once the bar is aligned as best as possible and then before doing anything to the front side of the bar, sand away loose fibreglass, and lay maybe 1 or 2 layers of fibreglass into the area. to do this cut a piece the size of the area and apply resin to it away from the bar and just lay it in position. then again, bog and sand and prep for paint with primer.
if your in melb and would like a hand to do this repair im more than happy to help out for a slab of jim beam and coke