Yes, modules made of bolted-together modules (which I’m calling submodules.) It’s not unlike the approach taken by CTAG with their Strämpler and TBA modules, or Bela with their Salt and Pepper modules, but ditching the monolithic builds. The idea is to build up a stock of standard parts and use them to quickly prototype new designs with a minimum of extra work, no bespoke circuit boards, and the improved testability that comes with standardisation.
I’ll probably be using this technique with Bela or ESP32 as brains, running software written in Faust and SuperCollider, and with high MIDI integration. The aim is interoperability with pure analogue modules.