Hey Phill, I'm glad that I found your post as I'm also currently restoring 3 similar ex-military land rovers from Singapore. The photos and information on your Facebook page are extremely interesting, but now making me think there's going to be much more work required than I initially thought!
Would you be able to share the part numbers for the alternator, water pump and vacuum pump if they're visible? Also of mine are in bad condition and have stretched. I've really struggled finding the right sizes from the VIN number (this just returns parts for a 12J engine)
Best of luck with the project and I'll share a picture of the vehicles im working on soon
Dan