#26 correct!
Summary so far:
0 = Lars-Erik Fisk's VW ball (ImpishGrin)
1a = Bombardier EMBRIO (ImpishGrin)
1.5a = Rose Monocar by Julius Rose (Paul Jaray)
2.0a = Gyro Transport Systems Gyro-X (Ray B)
2b = Rhiando Scooter (Paul Jaray)
3a = Piaggio P-103 (Arunas)
3b = Tuscan gyro bike (streamliner)
4aa = Marmon-Herrington Rhino (grobmotorix)
5aa = CEDRE 5x5 Solaire (Paul Jaray)
5bb = Dyno-Wheel Motor Bus (grobmotorix)
6aa = SHADO Jeep from UFO (ImpishGrin)
6bb = Jay Ohrberg's Monster Cycle for Barris (Paul Jaray)
8aa = Tycon AMLUV (Paul Jaray)
9aa = NSU Kettenkrad (ImpishGrin)
10aa = Iguana by Iguana Technology Inc (Paul Jaray)
12aa = Lely Multipower 420 (streamliner)
12bb = Lockheed Terrastar (ImpishGrin)
12cc = Landmaster (Otto Puzzell)
16a = Canadair Fisher CL-213 (ImpishGrin)
26 = Airoll MVT (Paul Jaray)