Thanks for the kind compliments everyone It was the most effort I ever put into a project (took me 3 months on and off :S). Hopefully the replies below are helpful (:
The edges were burnished with gum and finished with a slightly glossy top coat. I did this primarily because I still needed work on my edge painting skills. I liked how it turned out but I do agree that it can be subjective when it comes to unpainted edges. Below is a picture comparing the raw vs burnished edge.
Yes, I drafted the pattern myself with reference to pictures of a Prada handbag. Unfortunately, I do not have the soft copy version of the pattern :/
I used goat leather for the lining. The whole lining piece was assembled before I glued it onto the outer layer. Below is a work-in-progress picture for reference.
This was one of the hardest part of the project. I wish I had seen the video shared by Danne! (unfortunately that is a very recent video)
I did some try an error for the handles. Various online tutorials were suggesting a cotton rope core. However, I found it to be too sloppy and soft, probably because my leather was quite supple (cow hide, chrome tanned, about 1.5mm thick). I think the polyester rope as shown in the video will work as long as your leather isn't too soft. In the end, I decided to use rolled up goat leather for the handle core and it worked really great! Alot more effort but it made a very solid handle indeed! (making this bag really 100% leather discounting the thread, zips and metal hardware). Below are some pictures for reference.