There is a range of possible physical realizations for the particles of an amorphous computing engine. One attractive possibility is a Pinless Processor Particle (PPP), which requires no physical interconnect because it derives power from its environment and communicates with its neighbors without physical connections. To build a PPP seems possible in principle, but in practice is difficult using easy-to-obtain processes.
A less aggressive approach, which would suffice for near-term experiments, is to produce an Explicitly Powered Processor Particle (EPPP). This has explicit connections to the power supply, but no explicit communications connections. We expect that we can fabricate an EPPP that relies on currently accessible technology in a few square millimeters of silicon.