I don't think the Cyberster or in fact any MG falls into the old Build to Order model. There areThat's not my understanding of build to order, if I pair it up with JIT manufacturing, which makes sense for such a niche car/pricing... I really wouldn't expect anything past the numbers of paid deposits + maybe 20%
2 Power Options
5 colours
2 hoods
2 interior
That is a max of 40 different configurations, although some are not valid (red with red hood).
My last brand new VW there were over 6 pages of options running into 100s of configurations. You got told when it was being built at the factory etc but that way of working is hugely expensive especially when most setups are the same. Those days are gone.
I suspect it will be as @GranTurismoEra said they will make a set number and ship to dealers as ordered and when all the red smarties are gone you will have to have white or nothing...