i designed less complicated diy book scanner than russians two years ago and scanned tens of books since then . over 800 pages a3 size page book takes less than an hour
here is a sample book both pdf and doc format incase you want to check the quality. the book is in turkish
http://rapidshare.com/files/15913845...elojisi_ed.rar
pdf
http://rapidshare.com/files/12282036...Mitolojisi.rar
doc