FHA 203k loan process?

[JC Ceba]

Hi there, 

I'm trying to gain a better view of the entire 203k loan process to avoid surprises for major rehab purposes. Based on my research, this could represent a basic yet inexact roadmap of all the steps. Can you please comment or clarify based on your experience? Also,  below I have some basic questions:

-Process or possible Roadmap
-Get loan pre-approval letter
-Issue formal offer
-Get offer accepted - go to contract with a 35 day term
-Property inspection
---Key areas: building with solid ductwork, plumbing, structural, electrical, etc.
-Obtain blueprint from seller (if possible)
-Negotiate with seller any discounts
-203k Consultant is selected by lender
-Agree on pricing from the 203k Consultant (Work Write-Up-WWU/SOR)
-Proposals from a certified 203k contractors; one or more have to be accepted
http://203kcontractors.com/
-203k contractor meets all timing and guideline requirements, paperwork, estimate format, MPS & MPR's, etc
-HUD consultant walks the property with the contractors bid and makes sure it checks all the boxes for FHA requirements
-Appraisal post renovation
-Lock down rate for 30 days more (optional)
-Insurance policy quotes

Who gets the certificate of occupancy and is it for?
To what degree am I supposed to pay contractors in advance?
Can you add an ADU as part of the scope of work of a rehab?
Where or how I can find 203k approved contractors?