If it didn't weigh any more than 544 and stalls at less than 45Kts you can. RA-Aus register this A/C amateur built experimental, plans/scratch/kit built. (19 catagory, I think).
If it is built in a factory it can weigh 600KG and is LSA.
It is possible to have two identical Jabiru aircraft, both registered by RA-Aus, one 600KG factory built (LSA),and the other 544KG experimental/ kit owner built (UL). It is also possible to have a third identical jabiru factory built with VH registration with a factory desigated weight. All have different maintenance schedules, the VH and LSA more closely linked to the factory.
What LeadSled said.