Well, its been a while since the last update..
I've at this point added all the battery charging / switching circuitry and I finished all audio stuff. I also pretty much redesigned the entire board to incorporate 4 layers now, as 2 layers just wouldn't do it. There is now an internal GND and Voltage layer so I can just pull anything from those instead of using random massive polygons. There is still some stuff I need to redo, since for example placement isn't for some components isn't correct yet; and some parts need to be replaced entirely (uhuh huge mosfet). The regulators have also been tweaked a bit. This is the battery section also some other stuff, and please ignore the logo I still have to (re)move it.
I also added some indicator LEDs for charging, power, battery level and as an indicator for for example brightness, as every led is controlled by the same mcu that drives the lcd backlight and audio amplifier.
Fan control is now a thing using the same mcu and an NTC (thermistor) which will be sandwiched between the CPU and heatsink. As for other stuff, I ordered a simple board to test the regulators I'm using. I'll probably do the same for the battery circuitry and maybe audio amplifier.
I've done a bunch of testing with a certain microSD card reader which I am definitely going to use in my portable as it works very well. I'm still thinking about wether or not I should make it removable or if I should just solder it to the board.. oh well ¯\_(ツ)_/¯
When it comes to the main board inside the portable, i only have to figure something out for a dual tact mod with not a lot of space and maybe switch to Switch sticks. The case itself is pretty far done as well. I'm aiming for it to be done in April but most likely it will take a bit longer then that.
As soon as I get my new boards I'll test them and update this thread as well. That will probably be in quite a while though.