Looks a great start!

 You've got all the hard bits - hard top and original door tops.
What you have is an Export fully assembled early 1950 vehicle made in August/September 1949. Vehicles 06101685-86 (total 2) were CKD RHD vehicles that went to Annand & Thompson the Queensland distributors on 07/09/1949 for assembly. It is reasonable to believe this one was a fully built up vehicle that went to them also. I have the numbers of all 1950 CKD vehicles so can be pretty sure about this.
Many Annand & Thompson vehicles have the Land Rover logo on the front of the mudguard  on the drivers side so be careful if stripping the paint - try with a water blaster first. Some also had it on the tailgate. There may be some other A&T id on it - Lubrication recommendations plate, etc.
I would think the number you have quoted is an engine casting number.
To find the engine number look on the passengers side of the engine at the extreme front end in front of the small welch plug near where the front end of the exhaust manifold bolts on. They are little stamps - should be 0610xxxx if original. Even if original the engine number may be a couple of hundred different to the body/chassis number. If you do find it let us know. 
Also have a look for dated parts - wheels, starter motor, carburettor, coil,  radiator etc - this will give you some other details. I have 8667917 (third last 1949 model sold by Grenville Motors on 10/11/1949) and 06102933 sold by Grenville Motors on 8/2/1950. So that gives some more idea of when it was sold. 
Vehicle 06101670 was registered on 26/09/1949 in the UK.
These vehicles have ring-pull transmission, long nosed differentials. The ringpull instruction plate is on the firewall. Door tops with wire hinges.
All standard vehicles by this time were in bronze green, body, chassis and hardtop. The off white hardtop colour was a later option after requests from the tropics - too bl**dy hot!
The hard top was introduced a bit later so it's a later purchase and is great addition - they are hard to come by. Usually they split at the stretched area above the slope downwards to the windscreen.
Hope this helps.
Regards,
Bob
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