Can I remove (and then reinstall) the board myself and use a locksmith to get into the doors?

My advice is not to waste your money on testing clean with bleach water and buy a mildew mold suppressant from hardware store it's a chemical you put in a pump up sprayer keeps mold from coming back if on a painted surface get a fungicide paint additive and repaint area.

I have seen a few rookie investors hiring people that say they have experience and the next thing you know, they paid for a roof that now needs to be removed and replaced because it wasn't installed properly.

But ask yourself this, would you go invest the amount you have invested into this real estate into any franchise that you can think of and then hire people to run it for you while you hope it all works out in a largely removed capacity?

For the short(er) run, you can remove the tile and lay heavy plywood (3/4" or 1") on top of the existing sub floor - and shim to level.

The ones who do call will just want to waste your time taking you to eat some crappy lunch and barrage you with 100 absurd questions for their own gain. 

Remove all contingencies and up your deposit."

And, be careful about having a bed in there too...ie, don't use the guest room as your home office unless you can remove the bed before the auditor shows up at your door--they never do surprise audits.  

I like your approach.Personally I don't like wasting my time depositing checks, so I don't accept them or cash.  

A few RE agents have recommended that I get a co signer with more annual income so I can take out a higher loan and open up my options.Since this is an investment property at some point in the future the idea would be to do an FHA Streamline refinance to remove your co-borrower from the loan unless you carry them as a partner once you move out of the property.