1: it looks like the car's engine os vibrating or the mountings you've used are HARD , the softer the mounting the lesser the vibration
2: As you're thinking about the door panels (cardboards) changed you can get new ones from mintgomery road for around 1200 max (good ones)
About auto door locks you need to get central locking , will cost you around 3200 (steelmate model i saw there) and about mirrors i have no idea
3: about painter i got my car's doors painted from a painter near mozang and the quality is very good (i'm satisfied) if you say i can provide you with the exact coordinates
4: change the so called "JAIN" its cheap
6: the play may be fixed by tightening a nut in the steering column( kanghi)
7: To get chilled AC disconnect heater pipes , use blinds on windows , no idea about punjab AC but i can refer you to the AC mechanic from where i get the work done , a honest man
8:you can the new AC grills from bilal gunj or any other car shop pretty easily i guess
If there are any more queries feel free to ask
i'll try my level best to help
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