A standard plumber may suggest tearing the wall open because they don't specialize in auger techniques.

Stay true to your criteria and you will do great!

I also have no idea of the true scope.The common things that throw off timelines: - contractor schedules: typically your "budget" contractors will book many jobs at the same time, and in general have poor time management skills.  

So true, if it is not set up correctly.

The best way for true wealth building is through buy and holds so if you don't have to sell your asset but just tap into it's equity, that might be a reasonable option. 

Specialized direct mail is tried and true, but costly.

It's as if you were given the ability to see through others eyes and skin into what their motives are, their true thoughts and beliefs. 

Edit - As this is an auction this is probably moot but the recommendation holds true for future opportunities. 

I was wondering if there are any creative and effective marketing techniques out there to get prospects interested in moving-in.

Very true, i hear a good investor can find deals anywhere