The CP100 is basically a bunch of modules, yes, and freely configurable. And if you want to modify it more extensively, the back plane is fairly easy to rearrange so you can fit it with just about anything. To be completely honest, though, it's too old to sound good in any configuration. Optical sound in those days had a rapid falloff starting around 9kHz. At 11 kHz there wasn't much left without hf circuits to compensate, but even with those the best you could hope for (with a decent optical soundhead, plus Dolby NR and preamps) was 4-channel (matrixed) sound reproduction to around 12.5 or 13 kHz.
Today, you can replace the light bulb with a laser and fit the soundhead with better optics, and expect no more than 3 dB falloff to 16 kHz. Of course, nobody's using optical sound anyway because there is Dolby Digital with far better dynamics.
But as a piece of history, I think the CP100 is now a valued addition to my collection.