multi hour hedge fund interview

I have a hedge fund on site interview coming up. Im guessing 2-3 hours will be spent on a modeling test. I know for certain that there will be a modeling test. I am just not sure what the complexity of it will be. Here are my thoughts on how to approach it:

project income statement, project balance sheet, working capital drivers, project cash flow statement.
estimate debt so it basically stays the same or increases as revenue increasses

here is where i dont know which direction to go. is the important part to make sure the model balances and then to get granular in detail (do a debt schedule) etc? Or should I focus on making different cases for the business in terms of revenue and costs? if im making different cases.

for the dcf valuation... should i use ebitda multiple or perpetuity growth? Im leaning towards ebitda multiple because i did a practice model and got something much more realistic...

for the WACC calculation... do i really need to pull beta's and unlever then lever them?