We present a completed prototype of the AIGO seismic vibration isolation system. The design has been developed to satisfy the isolation requirements for the next generation of interferometric GW detectors. The system relies on passive isolation and includes multiple Ultra Low Frequency (ULF) stages to achieve minimal low frequency residual motion. Two complete isolators are being installed at the high power test facility located in Gingin, Western Australia. The performance of individual mechanical stages is continually being tested and improved. Currently it is expected that residual motion close to 1 nm at 0.3 Hz will be achieved.