That's pretty funny/cool......but needs a more refined way of dealing with the tape....I mean, holding it down with masking tape is kinda messy if you plan to reuse it...etc.
Maybe some sort of clips at the ends...?...also, a better way to deal with the output. I mean, dragging a couple of bsuted up Walkmans is OK for a prototype...but again, something a bit more refined , and them you could even market the gizmo.