And it's 1987, LCDs are not an option.
You could maybe do it with projectors, but they're hot, expensive, and finicky.
These days you could just get a super-wide LCD, though.
The custom system powering it was no slouch either.
It used a dual-processor system using 8mhz 68000s, and for graphics it used a custom Taito tile-mapping chip, the PC080SN.
These were all mapped into the same memory space, so the three-screen display "just worked".
Imagine you want to make a game, but you have to design the hardware to run it first. It's a miracle they ever made any money!