I took a break from cleaning (a.k.a. got enough cleared out to work on this) and I got the divergent stock rail knocked out.
(As a reminder the spiked ties are just there to help position and hold the track for soldering)
It’s certainly not pretty but so far it’s working gauge-wise. I think this is a different order than is suggested for the fast tracks fixtures but since I don’t have the fixture I’m trying to do it in an order that lends itself to having points of reference to keep things in gauge.