Finally an update here. I've received my frame after a lot of frustrating back and forth as described earlier.

Now that I have it, I love it. The paint job is perfect, in the chameleon green. I haven't finished the build, as I'm waiting on a few tools that it turns out I needed, but I've installed Conti Terra Hardpack 50mm tires on G1800 DT Swiss wheels (24IW).
The tires measure 48.5mm, and there is 5mm clearance both front and back. The smallest clearance is actually to the bolt at the top of the fork, which I'll be replacing with something low profile anyway.

Hello... did you finished your build? Could you please share some pictures to show colour and all bike ?