I choose the 1/300 scale, for the concern about the home space, and first I had to decide how to design the pattern of the engines on the first and second stage, and some other detail such the thickness (i like to use 160gsm paper ). Here an example of the excel sheet that I usually use for this purpose.
Here the first rough attempt to depict the first stage with the 51 engines.
More work on the stage
The first unfold
Building the first prototype
More to come
Best, Nando