Over the course of a weekend my boyfriend's mom and I finished the liner for my new bag. It's absolutely amazing, though I feel some chagrin over it being way more difficult than I had imagined - thus putting a lot more stress on my boyfriend's mom. We had to hurry a bit, and she accidentally put the zipper on upside down. She then had to rip it out and sew it back in the harder way, and the bright purple zipper is not more obvious than before too. It's alright though, it's a rainbow bag after all.
All there is left to do is sew the completed liner in by hand. So it will probably be a few more days until it's finished.