I am currently planning a 5 to 7 day walk around Alpine National Park and thinking of starting from Mount Buller. Timeline is April, if it actually stops raining

I am trying to find out what the parking situation is. If I simply google, I find the Mt Buller website that says you have to pay a fee and overnight parking is 2 to 4 km below the resort.
Can any helpful folks tell me what the deal is for summer/autumn (outside snow season basically) access and parking?
Thanks so much.