3 way switch wiring no neutral

House was built in 2016 but the builder did some odd stuff with the wiring. Because of how it’s wired I’m very unsure how to wire this circuit with a red series dimmer.

Here’s the current circuit setup:

Panel>Two wire>Light>3 wire>light>3 wire>box1>3 wire>box2.

In the pictures below box 1 will be the old work box, box2 will be the new work