i'd say the cart alone is worth the sixty. i want to make a nice wood table for one some day.
not sure what's going on with the vents but it looks like the sweeps just may cover the openings. ( if i'm seeing things correctly.) either way, there's no harm in a good cleaning to see what you're working with. like
@1911Ron said you can always plop another gas assist bowl on and rock out. if it's under 10 years old weber may send you a replacement, it never hurts to call their customer service and ask. but gas assist bowls (with matching lids) show up in the members sale section relatively often, and typically at good prices.
i'd say you did fine personally. nice grab.