I received the current record details from Guinness World Records along with the agreement and documents needed to recognize the claim:
The current record for “Largest book” is:
The Largest book measures 3.85 x 2.77 m (12.63 x 9.1 ft), weighs 1,060 kg (2336 lb 9 oz) and consist of 304 pages.
We must break this record in terms of dimensional size and number of pages. Our book will be:
4.00 x 3.6 m (13.12 x 11.81 ft) and the number of pages will be more than 336 (maybe 342).