Assuming I had the experience, I would only buy a place with structural issues if I had 1) an experienced and trusted structural engineer telling me a clear, and verifiable explanation of the cause(s) of the problem and a viable and affordable solution, 2) trusted and experienced tradespeople who would be implementing the solution (carpenter, mason, etc.) confirming with me that they could fix the issue (with 90% or higher confidence that the issue could be resolved within budget), and 3) confirmation from city inspectors that the issue (and an inability to fix the issue) would not result in condemnation/revocation of occupancy permits. ...and even then, I'd only proceed if I had the cash reserves to ride out a major series of unexpected problems (e.g.; time overruns, budget overruns, unexpected revocation of occupancy permits from the city, etc.) 

Sounds like a title holding trust is a no go in Washington.

Don't use it as a piggy bank, keep separate books and records, keep a proper accounting for credit card charges /etc, try not to collect rental payments on behalf...it goes on.b) All three will be subject to income taxes in your resident state. 

Once that amount is adjusted you'll have a loan payment updated based off of the rate and terms of the loan. 2) In you long-term expense estimates I don't see any assumptions for property management (7-10%), repairs/maintenance (7-10%), and vacancy (5%) so I would re-run your estimates based off of new expenses.

My dilemma is this: I would ideally like to wait until I have emergency cash reserves to cover 6 months of mortgage payments for all 3 properties.

Get the rehab work done through a "trusted contractor". 

But trust me, it's possible to make it happen even without a ton of cash or perfect credit.I’ve been in your shoes and managed to buy a number of properties without using my own credit or cash.

I just got off the phone with a seller who states that in a land contract, he would have to pay back up to 80% of payments to the buyer if the buyer defaults.

Well, They could lien your property for non payment.

I live at home with my parents currently and am trying to save money for a down payment.