Preseeded instalation alongside windows

[Vytis Valentinavičius]

Hello,

I am trying to make a "leech like" distribution based on Debian/Ubuntu. Main 
goal is to be able to boot from a removable media to RAM, then install 
(automatically) itself into machine alongside existing OS (most commonly 
windows).

Is there a way to order d-i to search for largest ntfs partition (extended) 
and resize it by a small amount, so that new system would fit in? Using a 
pressed file? Or this behaviour of ubuntu graphical install is not available 
using preseed files?

Furthermore, how to launch debian installer (or ubiquity) from a running 
system? How the installation will then execute? How can I monitor the progress 
of it?

Thank you.

--

Sincerely,

Vytis