Welcome to the group! The V143 is a pretty common boat.
You can try buffing alone first and see how it turns out. Otherwise wet sanding with 600 then 1000 then 3000 then buff then wax would really bring back the shine.
If you redo the upholstery, look under our vender section. Should be a list of people who do upholstery and a list of vinyl suppliers.
Where are you located?
Got any pictures?