Yeah, possibly an increasing number of decreases as you got towards the end? Or you could try adapting the circular bit from this pattern - it would probably be a bit fiddly, but you could pick up six stitches to be the initial six cast on stitches in the right front section, and then at the end of each row pick up another stitch and at the beginning of the next row knit the first two stitches together. No idea if that would work, though! Or you could knit the whole semicircle separately and then pick up stitches along the flat edge and start knitting the rest of it from there. ...possibly I am overcomplicating things now. :D