That kit is pretty cool. It is the result of a lot of input from people at
http://www.diybookscanner.org
There are many different ways to make a scanner. Mine brings the platten diwn onto the book instead of the book up to the platten. It was quite fun learning the skills to make it (carpentry, electrical, optical, lighting, etc. ) - however this kit makes it easier for those less technically inclined. BTW 150 pages per minute is a conservative number! It really makes it easy to tame your private book collection. Their forum also has tips/tricks on how to process the resulting images into a clean digital version.