Here is the finished model.
Next I will be unwrapping it. The new unwrapped UV 'islands' will have to fit in where the SAM launcher UVs were. This means that if I want the newer UVs to have the same pixel resolution has the already unwrapped areas, I will struggle for space.
I will almost certainly have to stack the newer UVs, which means that I will not be able to have too much unique detail (especially on the normal map).
I am assuming that the model shape is interesting enough to compensate.