The engineering test facility (ETF) for inertial fusion energy (IFE) is the development step preceding a demonstration power plant. As such, it must demonstrate, in an integrated facility, performance of all the key subsystems required for fusion energy production, including target production, injection and tracking, beam propagation and focusing, target gain and yield, chamber response and recovery between shots, heat removal, tritium recovery, and plant safety. In the present work, we combine our current understanding of the target physics and technology, thick liquid wall chambers, and a heavy ion driver to investigate integrated system scaling and operating scenarios for an ETF for heavy ion fusion.