I got all the Tango panels sewed together today with 1/4" seams. It was not easy, as I managed to sew bottoms to tops on several panels. PITA. I'll be doing a try on soon to see if 1/4" is needed for all seams before final stitching with the serger.
Even in spite of my sewing errors, this really is a simple skirt to make. Hopefully, the rayon I'm using is a good one; some of my other Tangos have met a premature death due to crappy fabric. I'm not sure if there's a fail-safe way to test beforehand.