A few links that may be of interest.
Kapit
Survey Branch REA
Royal Navy Commissioning Books
The Ibans of Sarawak
Molon Singapore Photo Gallery
Molon: Malaysia Photo Gallery
Royal Engineers Forums
Survey in India
Britain's Small wars
135 Sqn TA
Malaya Borneo Index
Brian Houldershaw on NMBVA
Bario and the Kelabits
Surveying Instrument Collection UNSW