Motorcycle lover: Yes.
Leather lover: Yes.
Degree in Fashion Design: Yes.
Making a leather motorcycle seat: Absolutely not.
Leatherworking is materials science, engineering, and magic. Try just making a simple belt. From a kit. You can do that in an afternoon. Now try making a faced leather belt (a fabric-backed belt, so your nice dress pants don't get stained). It'll take you a year.
Making anything out of leather is more machining than sewing. You drill holes. You use "thread" that is closer to metal wire than fabric. But the leather stretches and deforms. And seams are INCREDIBLY difficult... and that is where ALL of your weight transfers to immediately, snapping the thread holding the seam together, and opening up a hole... that instantly expands and causes the two parts to come apart.
Leather is a PITA.
And a good motorcycle seat is a difficult thing to nail down...