Looking at that tute, the overlaps of the two side triangles happen at the same place. Ok.
Ah, nurtz! I've been sewing triangle pairs at a time, with edges matching, not adding one at a time in rows. I've already done 202 pairs. Sigh. (Chain stitch too easy. This isn't going to be one of those quilts, apparently!)
I'll start again. Um, I have enough to work with, I think. LOL! (Not unsewing yet, at this point! Ha!). Now to calculate how many triangles to stitch together per row...
Taking a break now, though. A bit discouraged. Maybe after supper...?