One of my absolute favorite series of YouTube videos is "Building a new Amiga" from RMC, where he basically builds a new Amiga 500 with as many new parts as possible.

1: https://www.youtube.com/watch?v=ECu6i6WR7mo

2: https://www.youtube.com/watch?v=87q-TTG48Ew

3: https://www.youtube.com/watch?v=Va91bISkpKI

4: https://www.youtube.com/watch?v=4EsRI-5fblM