In truth, I use whatever is handy - from paper and pencil to whatever app(s) I have access to.
That said, I’ve just started playing around with Affinity Designer 2 - which I suspect would be a lot like working in Inkscape (since they’re both vector based).
That’s an interesting process. Thanks for sharing It with us!
That looks densely packed. (Which could be good or bad for the PCs depending on a number of things.)
Looks good!