Worth mentioning that the word "ultralight" means different things in different countries. In the US it's a single-seater with an empty weight up to 115kg, in most of Europe it's a single seater with an MTOW up to 300kg and a 2-seater up to 450kg. In Oz and Canada I think you use a higher MTOW, around 480kg?
So, in American terms you are flying something in the "Sport Pilot" category not the ultralight category - do be aware of that when reading American books (not that I'd wish to criticise 90-89a which I think is incredibly useful).
G