The NL323F chassis (coded A22) is fully low-floor. Its Exhaust Gas Recirculation (EGR) and PM-Kat filter technology (the latter developed by MAN) does away the need for additives in exhaust treatment, while still able to meet the Euro V emission standards. It was powered by the MAN D2066LUH-32 diesel engine (10,518cc) and fitted with 6-speed ZF Ecolife 6AP 2000B automatic transmission.
EDS was supplied by Hanover Displays, and air-conditioning was from Denso of Japan. This bus was also the first to be fitted with Ventura outward sliding doors at the exit for additional safety, instead of outward swinging doors found on SMRT's earlier fleet. At the end of the trial, SMRT followed up with a further order of 200 units, but with a different bodywork from Gemilang Coachworks and marketed as Lion's City SD.
Although this demonstrator helped to create a new long-term relationship between SMRT and MAN, it was eventually returned to the dealer ST Kinetics in 2012. By 2014, the bus was spotted at Gemilang Coachworks at Senai, Malaysia intact. SMB138Y's MCV eVolution bodywork and all non-chassis parts were then totally dismantled. It subsequently received a new bodywork that matched its production batch counterparts and was built to Australian specifications. The rebodied bus was then delivered to Carbridge as a staff bus Sydney Airport, New South Wales in November 2015. It has since been transferred for shuttle operations at Perth Airport, Western Australia.