Well, if
you're going to build a blinkenlights functioning
replica - go all
the way and do an IBM 360/70.
S/360 model 91 is the one to do (I assume you do not mean S/360 model
70). That is the one with the astounding number of lights.
Apart from anything else, there wasn't a 360/70 (tho' it was originally
intended that there be) - the mid-high part of the range went /50, /65, /75
(plus, later, /67 and /9x for various x - most commonly 1)
Andy