I've just completed renovation works a few months ago and already moved in to my new house at seksyen 32, shah alam. But I'm not quite satisfied with the grille works by the contractor that i've hired

I'm planning to do some modifications to the existing grille e.g
1. add reinforcement tightening (maybe with bolts) because currently the grille is just placed with screws to the wall..i think not quite safe.

2. additional bars to existing grille at bathroom window and also rear wet-kitchen area (because there's an open space quite big  underneath the awning)

3. the emergency exit at master bedroom grille is not functional, because the opening interfere with curtain rail. so it can't be open unless i unscrew the rail.

can anyone suggest me good grille suppliers? and willing to do small mods as mentioned. The reason I'm looking for new supplier instead of dealing with the previous supplier because they are very rude and not punctual with the schedule previously.

thanks in advance.