Space Invaders scarf progress

Some progress pics of the Space Invaders scarf:






I've since gotten even further... the middle of the scarf is just two-row tall alternating stripes, and I'm maybe 20% of the way through the stripes. It's awful work - knit, switch yarns to front, purl, switch yarns to back, knit, switch yarns to front, purl... and every two rows I have to remember to switch colours entirely. That is, if I've been knitting black and purling green, I have to knit green and purl black.
AUGH.
Knitting the chart is far easier than this... and also keeps my interest better.