Surface model of a plastic Coffee Dripper

I am looking for a surfacing method to model this plastic part. No molds or cavities needed; just the basic model. My so-called friend challenged me to produce a model and up till now, I have failed. Does anyone have any suggestions? Particularly with regard to the top lip and transitions.

Thanks.
I have uploaded plenty of photos. These are becoming more popular with coffee afficionados.

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I basically suggest you to go for "solid to shell" stategy instead of surfacing. I would be easy to make that lip. I have attached a stp file of model (mostly similar..)

 
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Thank you Yogesh - your file is very well done. I will take your advice on this one. Best regards. Shaun

 
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