12.04 - Make a custom iso of current Ubuntu set up

I have been running on a dual boot of Windows and 12.04 for quite some time now. Primarily because of space constraints and the fact that I might not have booted into Windows in the last 6 months, I would like to format the entire machine with Ubuntu.

While, I am aware of the method followed to remaster the original iso and make a custom one, I do not know how an iso of my current setup can be created. It is of utmost importance that I use my current setup because I've configured my build according to the projects I work on.

Any help would be greatly appreciated!