As @Patricia Steiner said, in my state, an "As-Is" contract allows the buyer to walk away for any or no reason during the inspection period, while the "Standard" contract allows for the seller to remedy certain items to "working condition" and does not necessarily allow the buyer to back out scot-free.If you aren't sure of your contract, consult your Attorney, Realtor, or title company for some direction. 

This seems quite limiting if you're trying to BRRRR a property in under 6 months since so much of the out of pocket expense are the rehab costs which you aren't able to refi out of.Is it really as black and white of a choice as 1) wait 6 months to pull out the full 75% LTV or 2) if under 6 months only pull out the original cash purchase amount?

We aren't correctly sized but it could work for you. 

Ideally this would mean that this single family house would need to be a large 3 floors plus basement with ample space for the aforementioned as well as units which aren't 'weird'. 

I'd want to ensure they aren't crossed up there, but it may be that the property is owned by the homeowner still. 

Given that the Omaha market is pretty hot and there aren’t too many multifamilies out there to start with, we’re considering changing our strategy to start out using BRRRR on a single family investment property so we can get started earlier.

They are caught up in the myth and aren't really motivated to sell yet.

If you aren't good at conflict resolution, hiring a property manager may be a good idea if owning rental property is a goal of yours.

The CCROI is great (over 20%), but there will be little appreciation for when If and when I go to sell the property.The general rule of thumb in a super competitive market is that when interest rates are low and there aren't a lot of deals you need to look to secondary and tertiary markets to get great cash flow, or maybe find something you can force appreciation with.   

Even investor mortgages that aren’t HML’s, look at your income to a certain extent.