Join as you go is for all-crochet or all-knit projects, I think, yes.
Mattress stitch, slip-stitch seaming, knitted three-needle bindoff, single-stitch crochet seaming are in one bucket in my head. :) That's in order from least to most visible, since the knitted bindoff is usually done wrong side and I've seen sg-st crochet done right side decoratively.
Hm, if you've made the hexagons already, then I think it may not be join-as-you go. Usually the latter means building the next stitch onto an existing one without adding a buffer zone--next hexagon uses the edge of a prior hexagon. Doesn't matter how you do it, as long as it looks the way you'd like it to and is tolerable to implement!
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Mattress stitch, slip-stitch seaming, knitted three-needle bindoff, single-stitch crochet seaming are in one bucket in my head. :) That's in order from least to most visible, since the knitted bindoff is usually done wrong side and I've seen sg-st crochet done right side decoratively.
Hm, if you've made the hexagons already, then I think it may not be join-as-you go. Usually the latter means building the next stitch onto an existing one without adding a buffer zone--next hexagon uses the edge of a prior hexagon. Doesn't matter how you do it, as long as it looks the way you'd like it to and is tolerable to implement!