I have uploaded these as a pdf file. Please let me know if this does not work for you. The pictures on the first, and second page are not the best, so on page 1 lower right he is drilling the hole into the side of the acorn with the lathe turned off. Page 2 the lathe is again turned off and he is hand sawing in order to separate the top from the bottom. The place of separation is seen more easily in the diagram above.
Upon clicking the link, it should give you the option to download. Save it to your computer (My Documents) so you can bring it up to look at, or print.
http://www.MegaShare.com/dnd/1854306/c8fe9b987b524e97ab161a4d481b71c0/Acorn Birdhouse Plan.pdf
Good luck, and as always feel free to call if you have any questions or just need a talk through..