The 120 kt sea level LSA limit applies in the USA, but not here. The Sling has twice the fuel capacity of the RV12, although full tanks, 2 people and baggage will put it over the 600kg LSA weight limit. That won’t matter if you build it as VH experimental since it’s designed to the VLA standard which allows 700kg AUW. If it’s going on the RAAus register, you will be limited to 600kg.