I use tape too
Thanks for the article.
I use tape myself to mark straight lines. My method of late uses a laser square, whose light can be seen on the "nailed down" fabric. I mark where the laser lies with masking tape, and that's where I cut, burn, or hem.
In the mathematical study of real analysis there is a quip that "locally everything is linear". This means that any sufficiently well behaved line, when you look at it very very close at one point, looks like a straight line passing through that point, even if viewed globally that line is very curved.
The application to DIY hammocking is that under the sewing head everything looks straight. If you want a globally straight line, you need to take a global view. Use tape!