I have done 23 of the 59 chapters now (and am hoping to get to 30 by Christmas, so I can pass the halfway stage at least), and the file is viewable and printable at:

http://www.corkirish.com/wordpress/niamh-in-modernised-spelling

Comments and criticisms are welcome - and I hope I am using a spelling that is faithful to the dialect, but as Seán W. also pointed out recently, close to the Standard, so as not to artificially enhance the differences. I think I am achieving this and it is very accessible to those who read only Standard Irish!