If this really is your first ever wheelbuild then you chose something with quite the steep learning curve
I've been building wheels for many years. I started out with rim brake alloy wheel stuff mostly for commuters and urban bikes, like lacing wheels with hub dynamos and stuff for myself and friends. From there I went to building more complex spoke patterns and carbon wheels and so on.
I agree with most of your choices except for two:
A 2:1 spoke ratio made a lot of sense on rim brake rear wheels IMO, where one side took all the torsional load and therefore is laced in a 3 cross pattern while the other side can be laced radially (which is how the Ford factory did it way back on laced car wheels when they invented the idea). It made sense because of the drastic difference in spoke angles with the DS spokes being much further inboard due to the cassette. Ever since disc brakes, both side's spokes had to move inboard and the difference in spoke angle and tension isn't as bad as it used to be. So the advantage of 2:1 isn't really as big as it used to be. Personally, I stopped doing it. I do think that asymmetric rear rims with a slight offset to the NDS make sense to further correct the difference in spoke angles. But that's about it.
The other thing is internal nipples. I think it's not worth the hassle. Sure, you chose superlight rims so it might be better to err on the side of caution. But I think Enve's argument that this makes a sturdier rim is marketing bogus. What is much more important is that the rim bed is reinforced as a whole, which is the case with most carbon rims. And it's important that the spoke holes are drilled cleanly and accurately in exactly the correct angles, so as to not cause stress at the nipples and threads due to bending moments. This is the case with most well made rims, but I had bad examples from some Chinese sellers. Like you, I've sourced rims from various Aliexpress sellers over the years.
The aero benefit of internal nipples might be there. Honestly, I don't care. If you ever choose to run your wheels tubeless it'll be a huge PITA to access the nipples should you ever have to. Also, since weight seems important to you, it'll increase spoke length and therfore makes the wheel marginally heavier. A well built wheel will usually not go out of true. But there can be incidents like hitting pot holes in a race or whatever.
But like many things in wheelbuilding, this is just my philosophy. I think you did a stellar job and built a super impressive wheelset. Congrats! And it's a really nice feeling to be riding around on one of a kind wheels that you yourself built.