Thank you for replying in such detail!
With regards to seedling cuttings (I actually looked at your blog post on this earlier today), I do plan to do some cuttings and leave some as-is to test it out (I realize seeing the results of this will take a long time).
As for the placement of the seedlings in the tub, they’re not spaced out well, which is was prompted me to make the post. The crowding will have an adverse effect on the vigor of the seedlings and I intend to space them out. There’s an adequate amount of medium, but they’re too close to get good sun to all needles.
I’ll repot according to your suggestion (immature needles fully grown, prior to trunk elongating). I do intend to cut the taproots, but I’ll keep the seedlings under shade cloth (with misting as my work schedule allows) for a month or so, if that’s advisable.
I’ll post pictures of what I have so far when I get a chance (probably tomorrow, but who knows. lol)
Thanks again for your input! From my experience with bonsai blogs/internet bonsai research, you’re THE most helpful person I’ve met.