The starter motors and other parts are not likely to have been put on in any order. As CKD kits arrived the parts would have been put in stock and drawn out to put on cars completely randomly. From talking with former factory employees stock for about three months was usually held.
Also, when CKD packs came out they were usually in small batches, such as six or twelve cars to a batch. You wouldn't get six complete cars in one box, though. What your would get would be more like in one box all the body panels; in another box all the engines/gearboxes; in another all the wheels, starter motors and other components, etc. So, it might have been three or four boxes to a batch of six or twelve cars.
This is certainly how it worked for every other CKD car.
Now, how many batches would come out at one time? I have no idea, but keep in mind that when the factory was producing its own panels they were working to three-months' stock. Remember this was pre-decimal days and the way the Poms worked they were probably sent by the dozen, so maybe five to ten dozen, or six or twelve dozen, at a time might make sense.
It is all hypothetical, but if you had, say, twelve dozen packs of twelve cars at a time, that's 1728 cars at a time. But of course, they would have been bringing in Morris Minors, tractors, a few light commercial vehicles and the Minis - they would not have brought out a complete ship load of Minis in one go. Where would they store them all for a start, and it would not have been economically viable for a ship load to contain only one model of vehicle. When only looking at one type of vehicle it is easy to forget that the factory was producing a wide range of vehicles, with different levels of local content, as well as fully importing other vehicles, like MG and Riley for example.
So, given that we have "established" that 3449 M850s (assuming this is correct) came out before the floorpans and other parts were changed to the later type, they would not likely have come out all at once, but in a series of batches.
Below are three photos of typical CKD packs (would love to find similar photos of Mini CKD packs).
In the photo of the three boxes on the forklift, two are marked Morris Minor panels, while the third is unmarked on either side facing the camera.
The photo of the box being opened up shows body panels only. Notice, too, that CKD body panels didn't necessarily come in "completely" knocked down, despite the definition of the letters CKD. Some parts, such as floorpans, doors, bootlids and bonnets, came in already partly assembled.
The photo at the bottom shows MGA chassis and parts being crated up ready for CKD export. The body panels and many other parts for these three chassis would have been in other boxes.
