According to the www:
"At his August 2001 physical, Bush was 6 feet 0 inches tall, and weighed
189.75 lbs"
189.75 lbs ~ 86kg
The Second Edition of the OED weighs 62.6kg and consists of 59 million
words on 21,730 pages. (
http://www.oed.com/about/facts.html).
So assuming the printed WP had the same size volume and type of binding
as the OED, it follows after a little calculation that WP would weigh
the same as GWB if about 3350 words were put on each page. This is
possible if you use a size 8 font and big (OED sized) pages.
The heaviest President was William Taft (1909-1913), at 322lbs. If we
are allowed this weight, we could probably use size 10.
Pete