Ultimate Catamarans Introduce Spaceline 88 Ultimate Catamarans is a company based in Germany with its facilities in Croatia. The company is known for building aluminium-based catamarans from approximately 21-meters through to 45-meters. Their line of catamarans is known as the Spaceline range. The latest addition to the Spaceline range is the Spaceline 88 which is a 26.7-meter power cat. For a monohull, 26.7-meters is considered fairly small but because the vessel is a twin-hull configuration, the onboard space is significantly greater than any monohull of the same hull length.