If you google "female android modeling in maya", it looks like someone posted DT's old DVD tutorial up on youtube. I believe Part 3 or 4 goes over modeling the shoe/boot using poly and fine-tuning as sub-d.

Josh Robinson has a 21-page boot box modeling tutorial in PDF format that you could try. It's done with Silo but the techniques are all the same:

https://www.joshrobinson.com/tutorials.html

I also have a 32mb time-lapse avi of someone poly-by-poly/edge modeling a small boot that I just posted to yousendit.com for anyone to grab:

Small Boot

No idea where that one's from really...probably found it on one of the modeling forums when looking for time-lapse stuff.