[She takes that as her cue to hand the notebook over to her, seemingly pleased and trying not to be too smug about it. She's a high-class lady after all, and humility is important.]

All of the above. To be more specific, I have to know the make-up of each material I create, as my Quirk allows me to convert my lipids into different chemical and molecular structures. Something like this is simple enough, but the larger it is, and the less familiar the material is, the longer it takes me to create any object.

Of course, if I don't think of the scale and design as well, it could cause it to break apart. Every detail counts.