Abstract The Technology Modeling and Analysis group of the Los Alamos National Laboratory is using 3D-process simulation to evaluate options for transparent disassembly of nuclear weapons. Transparent warhead disposition is likely to be a major issue of future nuclear arms treaties. Using Questw, from Deneb Robotics, we have developed simulations to help visualize what treaty observers might see during facility inspections or while witnessing weapon disassembly operations. In addition, these models help assess the impact of observers being present in a working facility. Operational delays due to resource unavailability or rerouting traffic to bypass observer-occupied areas are a major concern. The report describes the process.