The infamous “Nintendo PlayStation” is one of unreleased consoles that a lot of people would pay heaps of money for should it be released. Since releasing that console is quite impossible, one person was able to build a unit composed of the SNES’ Satellaview attachment and some components of a PlayStation 1, as Kotaku details:
something from the same era that’s even rarer is Nintendo’s repeated efforts to create a CD-ROM add-on for the SNES, which ultimately came to nothing
That add-on was supposed to clip underneath an existing SNES console, just like Sega went and did with its Genesis/Mega CD combo, and while we still haven’t found one (if any prototypes ever existed in the first place), LASTFANTASY (via Attract Mode) has gone and built a pretty good likeness of one using a SNES, its Satellaview attachment and the guts of a PlayStation 1.
image via Kotaku