One of you asked about the tool I used for edges so here it is. This is your basic run of the mill No.11 Exacto blade. The key to this tool is that the edge has been taken off and the tip smoothed out and then it has been polished using a dremel.
I use this for sharpening edges or trimming excess putty. It is also good for cutting panel lines and details in hard-line stuff like guns and machinery.