I have been doing a lot of research on the Ace, what I know. Every car had the "hand of AC" we have no replica cars. So what we have is as follows
DE1016 was the first of the Ace Brooklands and the last one was DE1060, Chassis DE1061, DE1062 and DE1063 got developed and put in "Stock WIP" - You will see I refer this as Mk1 and Mk2, the first 20 cars had some differences, then after this they got into production status.
Now the interesting point DE1061 got taken out of stock and a new front end was developed (square head lamps) and GRP bonnet was given. This is commonly called "South African Car" which is slightly incorrect. Only a limited amount of work was done out of the UK. So actually I have all classified as Mk3 cars. So DE1069 is actually an Ac Ace Brooklands, but it will be a late Mk.3
Now if we move on, we have DE11* which are chassis / body obtained by a number of people. Again all AC parts and all AC laid chassis. I can confirm all this, before John Owen passed away I had information. So technically I do not have formal AC register, but I do have information. (lets call them continuation cars)
The last set of cars are 4 Aceca Brooklands, very easy 1 prototype (actually an extended DE10 chassis), 2 AC built cars (steve gray has one, I have the other) and 1 Ac Chassis, Body, etc. again I have the complete car and all parts. John provided a letter confirming the last one from the register.
I have been piecing together all the information. So every Ace Brooklands / Aceca Brooklands is original car from Ac factory, but some have been put together outside the factory.