Oh a bandit seat was the first one I ever sewed when I did some work for my friend who has a seat recovering business.
It’s certainly doable, I know the first one I made was sold, so it can’t be too difficult.
Can you pick up a seat from a scrapper, even if the cover is ripped, you should be able to deconstruct it to get a pattern.
You will be sewing through several layers of vinyl so will need a fairly robust machine.