Gruntz has put their rulebook up on Wargame Vault for your downloading and playing enjoyment.
From the release:
The Gruntz 15mm SCI-FI Wargame is now in full colour printed format and available on the Wargames Vault.
It has grown from an 88 page 1st edition in PDF to a full 135 pages in full colour. Existing owners of the v1 rules are entitled to a free download update of the v1.1 PDF.