The A2Pico hardware comes in two flavours: SMD and TH, see https://github.com/oliverschmidt/a2pico for details.
The other day, the design files for the most recent TH variant were published, see https://github.com/rallepalaveev/a2pico/tree/main/A2Pico.v2.6
2.6 is functionally identical to the previous design. However, it puts all "user serviable parts" on the top and comes with a nice switch to turn USB power delivery on/off. And it comes with enough clearance around the USB port to allow for even bulky types of USB-A adapters (which are necessary i.e. for connecting a USB-mouse).
Now the SMD design files are available too, see https://github.com/rallepalaveev/a2pico/tree/main/A2Pico.v2.7
The 2.7 is an SMD design that's functionally identical to the 2.6 TH design.
I've published a new A2Pico firmware that plays the 'Bad Apple!!' video on the IIgs.
Here's the demo video: https://youtu.be/CnemTrIuyy0
Here's the project: https://github.com/oliverschmidt/bad-apple-iigs
https://hackaday.com/2024/08/27/using-the-pi-pico-as-programmable-hardware-for-the-apple-ii
A2Pico is now available in reasonable quantities at Joe's Computer Museum :-)
I just release a significantly enhanced A2retroNET firmware for A2Pico. A2retroNET implements (despite the name) a mass storage device.
https://github.com/oliverschmidt/a2retronet