Check out Captain's if you wanna see more insane neo-bootlegs. There was a Sinistar one a year or two back that was an impressive waste of particle board.
And it can only be a bootleg because what I'm after is the sub-board that bootleg uses in place of the CF37201 so I can copy it. I have a real docastle here where that custom has died.
There is also a DO! Run Run/Super Pierrot bootleg floating around that has the function of that custom...
The masses yearn for a Y-Unit multigame but as far as I know it's not even possible to convert one game to another without moving non-programmable chips over yet. That's still not solved. Sound would have to be patched too (the sound board changed halfway through).