al smith used to play a huge honking chord with FOUR decks. it was a really floppy monster too, until my dad built him a set of aluminum brackets to hold things in place.
just be careful. its easy enough to whack yerself fair hard in the chops with stock chord without adding at least 50% more mass to shift around. good luck with that one!
btw, i never did get into chord splitting. we didn't do a lot of jazz, and, at least in the trio format, i never felt the loss of any chords that weren't available on my chords.
i used to watch eddie gordon in awe, both of his rhythms and his splits. boy can that man play!
i think al fiore did some splits to, but if he did, they were pretty subtle.
one of the highlights of my life came when murad, fiore, my dad, brother and i were playing in my dad's front room back in the eighties. al asked me to play peg, and i balked a bit. after all, it was HIS song, right? so he reminded me that he'd known me since just after i learned to walk, and told me to play the thing. so i did, and got to hear al playing chord harmony to my chord lead. WOW!!!! made it really hard to concentrate, ya know?
oh, yeah. i'm still a bit mystified about turning a chord upside down to get additional splits. the geometry on that one escapes me. but then again, a lot of things do