@Satha Palani I used the 203K loan when we bought our duplex and I put $64K into repairs. It is a good loan product if there isn't another option, but it is time intensive. @Nicole Pettis has some great insight, and I think answered your questions, but here are some additional things I learned:
1. The FHA appraiser can make or break your project. I wasn't able to find one in the city I live in, so I had to hire one from about 1.5hrs. away. This meant that each draw inspection had additional fees that weren't orignially built into the loan amount. Also, the FHA appraisers in this area seem to be home inspectors as their main business so you might be able to have them do the home inspection as well.
2. If you are already looking at repairs of $40K, then you are into the standard 203K. You have to figure into that 'repair' total the cost of inspections and ensure that fixing all the code issue repairs still leaves room for cosmetics. It sounds like it would be too tight for the streamlined.
3. You have to make sure that the contractor's bid is water-tight...if there are additions or changes after the process has started, it's a pain to adjust the available funds through the loan (but not impossible).
4. Don't be intimidated by the folks handling the paperwork on the mortgage side or the appraiser side. Once the project starts they have a vested interest in making sure the project is completed, so they will be willing to work with you. That helps if you have to adjust the original plan like I did...they didn't want to, but they couldn't really force me to do otherwise.
5. You will have the option of draws coming to you for dispersement, or to your contractor. Do not allow the contractor to get the draws directly!! Set up auto-deposit and disperse the funds to the contractor. Otherwise you could get hosed, and you will find that you have very little leverage/say with the contractor completing the job.
6. You may find that you have to educate people on what is a rule with the loan and what is not, even those that should know better like your mortgage rep. I found that this was a loan product that I had to keep a very close eye on.
7. If you are doing the standard, make sure you check into a builder's risk insurance policy. There is a good chance that your homeowner's policy will not cover you during construction. Builder's Risk policies are more expensive and that will affect your bottom line of what is available for rehab.
All that said, it was the only way that we could purchase what/when we did. It was a pain and I had to fight for my position constantly but it worked out in the end.