I decided to rent my 2 extra rooms to house hack, greatly reducing my expenses.

Additionally, I'm reassured by those of you who suggest I can extract up to 80% equity as I'd read it was more likely to be 70%-75%, although that will likely differ based on property type.

Additionally, ask them how long they have been managing properties and what types of properties they've managed.  

However, I have a comfortable allocation of secured funds for investing and there other reasons I believe I'd qualify for other loan options.My question is, how do I see about getting additional pre-qualifications on identified properties/home values without lenders pulling my credit?

You would be wise to find a decent agent who will broker the transaction for a reduced fee and represent you both, and split the cost.You're doing a real estate transaction in the most litigious and law-choked state of the union.

I did contact numerous companies today and some that offer backup does not offer other features with the policy or reduced coverage.

Additional BackgroundContractor says there is a lot of "unknowns" in the project.

Guidelines from Fannie Mae:-Calculation of Reserves for Multiple Financed PropertiesIf the borrower owns other financed properties (determined in accordance with B2-2-03, Multiple Financed Properties for the Same Borrower), additional reserves must be calculated and documented for financed properties other than the subject property and the borrower’s principal residence.

it seems like the partner with the mortgage is taking on additional risk and not allowing him/herself the opportunity to finance other deals in their name.

 So on a deal like this I asked myself how good is the deal for the additional risk.