Good work nick... 
Seems you to have got it working properly.. Any troubles uploading til now?
I seem to have done all of these stuff mentioned earlier but still my problem still remains... 
Anyways let me try doing it ditto as u mentioned in your tutorial...
@ nick
Tried uploading larger sketches? and Is the bootloader uploaded by your https://github.com/nickgammon/arduino_sketches/tree/master/Atmega_Board_Programmer same as the one provided by maniacbug?
Sorry Wrong link edited...