Methods and systems for producing a mobility assist hybrid vehicle from an OEM hybrid vehicle may include: Removing the hybrid battery from the hybrid vehicle; removing at least a portion of a floor of the hybrid vehicle that extends from about a longitudinal position to about a second longitudinal position; mounting a replacement floor assembly to the hybrid vehicle, the replacement floor assembly defining a battery well sized to receive the hybrid battery, the battery well being located at about the first longitudinal position, the replacement floor assembly also being configured to receive a mobility access system at about the second longitudinal position; mounting the hybrid battery within the battery well of the replacement floor assembly; placing a first cover plate over the hybrid battery; mounting the mobility access system to the replacement floor assembly; and placing a second cover plate over the mobility access system, the first and second cover plates defining a substantially flat interior floor area for the first and second rows of occupant seating.