LBO modeling help

Hi I received a take home LBO case study during an interview. I am not in the States but in APAC, so the procedural nuances may be a little different.

So I am to make an LBO model for a company where the transaction will end at the end of 2022. The company only reported its 2021 results and 1Q22 results. Should I project out the full 2022 financial statements before making a pro forma balance sheet at the end of 2022? Or am I fine creating a pro forma balance sheet off of the end of year 2021 results?

Also, how granular should I be in the details of the income statement? Should I project out each of the P, P, E and leases separately? How about the S, G, and As? 

Thanks in advance guys.