I listed it without the address on Craigslist, they have a particular policy where hoa board approval is necessary.  

Just a few Mobile homes or even one and manage it to get a Bird's eye view while still   doing everything else you suggest??

You might add a clause that owner is to approve work and materials at whatever stages you find necessary for you to allow the work to continue.

Should we approve them as tenants (with or without co-signer) or wait for the job confirmation next week?

I have already been pre-approved for a FHA loan. 

After sending a pre-approval letter, he responds again:"She will need at least 10% down ( most likely 30%) as this will have to be a non- owner occupied investment purchase. 

Most strategies on mobile homes are buy and flip, not buy and hold.

Many societies want you to submit your plans for approval.  

No bank will fund a project prior to it being permitted and plans approved.

We don't have very good credit so we cannot go the bank route for a loan, we are looking for hard money lenders but we just have not yet got approved, we have been saving to make this dream a reality so to speak and are just a little concerned with investing all of our savings in a shell without knowing we will begin work straight away.