Finally after 3 months I have my pi2aes. So I was able to plug it into my rpi4 and power it with my linear power supply. As promised, I took some pictures of my streamer inside, there is not much to show, but there you go (but please keep in mind, I had an old chasis so I tried to use the existing mounting holes and of course had to make some new necessary holes for the rpi4)
Have fun guys 