Hi! I saw your multifill tutorial but I'm still curious as to how it helps-- the flat colors are all merged into one layer according to the screenshot, and each part is in a random color, so wouldn't you still have to redo the flats with the color palette you wanted anyway? o.O
Yes, but you can just use the Paint Bucket tool and fill it in with a click.
If you do flats manually you have to either color in the sections with the pen tool (think a kid with a crayon and a coloring book), or use the selection tool, which can be ineffective and takes longer because you have to select every single separate section.
I hope that elaborates on it!