Looking at a mobile home from 1972. What should I be concerned about?

[Eric Wallace]

I have no experience owning a mfg home.  It is a 3BD, 2BA home with about 1300sqft, a detached garage on an owned lot so no lot fees.  Structurally the home seems sound and looks like mostly cosmetic work needed.  My main concerns are these:

1. The ceiling has some water spots but noting looks recent.  The roof is old and likely needs to be replaced.  The problem is that there is no way to get into the "attic" space.  Suggestions?

2. Nearly every ceiling in the home droops a little.  They all seem solid and I think at some point someone has floated in a second layer of covering.   

3. How will a bank appraise it once it is fixed back up?   I have looked for comps but they range from 8k up to 50k so it's hard for me to guess what the place would be worth once fixed.

I've bought homes "as is" before so I know from that standpoint to assume the worst and hope for the best but I am mostly just unfamiliar with Mobile Homes and how to assess what I am seeing.  

Appreciate any input from experienced owners. 

Thank you!