Well, we learn by doing...again.
I've run into some difficulty which also underlined some of the mistakes and compromises I made along the way. I know it's mostly the way I'm looking at it, but some things seem a lot clearer than they were before and the model looks somewhat stained by the mistakes I know are there.
And so for my own peace of mind and taking what I've learned I'm starting again from scratch. The big difference this time is I have a better plan and a much clearer sense of what I'm doing. Since a lot of fumbling (but certainly not all I'm sure) can be bypassed I should make a lot faster progress.
In the process I sometimes listen to TAS music sound clips...or I hum or whistle them to myself.