There’s a manifold attempt going on in the 16oz cup content here. I also did a mainline/manifold in my own journal.
Usually the standard is 8 mains/cola’s. I’m currently doing a 4 main version right now but did 8 mains in DWC for my journal here when I joined up. Can go to 16 mains but I think you hit diminishing returns that way. 8 seemed like the best mix of getting solid results without spending a TON of time in veg.
I would not mainline or do any high stress action on auto’s. Any extra stress can cause them to flower immediately. Would be something you could experiment with if you know your strain, but yeah wouldn’t do it on a fresh one you’ve never ran before.
Mainline/Manifold tends to extend veg a good 20 days or so assuming good solid growth the whole time, you don’t have this time with auto’s as they tend to flower as soon as they mature which is usually at ~30 days. I would only mainline/manifold photos for the start.
ymmv though ^^