I spotted this cool photo at the Subrosa webpage.
Its Kip Wiliamson doing a curb-endo on a Subrosa 24" Letum Cruiser BMX with 80's Skyway mags with a very nice box right up front,
photo by Chip Riggs.

That's a very unusual looking box. Look at the positioning of the two tape decks! I wonder what it is?

Thanks for posting the picture.