I like the Pro XL suspension parts on the Turbo's aluminum chassis...that carbon fiber just sends it over the top.
You should ditch the Ultima gearbox and try to find a Triumph belt drive trans....w/minimal mods, there will be no more problems with finding spur gears!
Projects and shelfers: Late Edinger, RC10B2, Dual Sport, GT, Kyosho Turbo Ultima, Triumph, Tamiya Sand Scorcher, Blackfoot/Monster Beetle, '67 Beetle, Nikko Rhino, Traxxas Fiero, Slash, Hand-built Dune Buggy..all on here somewhere...