Nonempty regular transport realization

Assume finite local preparation, classical processing, destructive readout, and exact finite-register carriage along declared causal paths are permitted. These are ideal operational permissions, not derived field dynamics.

Choose a developed segment of length $\ell >0$ in a compact regular tube. Install $n+1$ stations with $p$-qubit payload registers, $p\ge 1$. Initialize all but the sender in a fixed blank. Generate and retain the complete classical certificate, wait for a positive buffer, and forward it on explicit causal wires. At each hop exchange neighbouring register contents by opposite carriage paths of developed duration $2\ell /n$, not by an instantaneous distant gate.