I remember I drew up a plan to make a portable SID player in 1994. It would consist of a cpu, sid and the corresponding electronics + memory to hold sids.
Project Name: WALK-SID (kind of influenced by the Walkman from sony :rofl:)

Of course, it was never realized. But I loved the idea.
Current project is putting the Replay board in its casing, adding the two PSX-64 adapters inside and add wireless PS2 adapters inside so I can have wireless Amiga-Fun from the sofa

Sub-Project: Making a bezel for the backside of the Replay board.