Thanks for letting me know about the top and it's connection to the door window problem. This is another solution I will definitely try.
So far I've done this myself:
1. Changed the mud flap. I got it by $25 with shipping free in ebay

Porsche quoted me $95.
2. Changed pollen and air filter. Bought both by $50 out the door. I was surprised to see that there was no pollen filter cover and the filter is not properly attached to the car. I have to just slide the filter inside and lock by a plastic clip. I never asked the dealer but someone just mentioned here that they charge $450.
3. Recharged my AC. Bought freon and meter reader by $40 out the door. Independent Garage quoted me $175 to recharge the AC. The meter remains and next time it will be only $20 to recharge my AV
... and it's all because of you all that I could do this. Thanks a lot for sharing your knowledge.
I hope the door window works....
This is my upcoming projects and I will be very glad if you share your experience:
1. Paint brake calipers.
2. Paint rims.
3. Replace all the four tires.
4. Change brake pads (when I paint the calipers).
5. Change transmission fluid... I don't think I can do this on my own because I will need tons of jacks

6. Flush brake... I don't think I'm doing this one either
Any comments that I should be aware?
Blessings!!!