The SSD size isn't a major factor depending on where you store the output designs. I'd be more concerned about the need for a better CPU as click here says:-
' CPU: As high a GHz value as possible, ideally 3.0+ GHz. Less than 4.0 GHz may act as a bottleneck for fast graphics cards such as the GTX 1080 and Titan X (Pascal). More cores than 4 will not make a difference.'