I had my ct converted to elsa in May 2010.
Here is what I went through.
Only a few DAR's can do this conversion. You will get it done quicker with the DAR, but they will charge you.
The FSDO will do it for free, but you are on their timetable, this is not a high priority for them.
I used the FSDO, It took several weeks to get an appointment to complete this process.
Converting an S-LSA to E-LSA:
If you are the owner of an S-LSA aircraft, and wish to change it to an E-LSA (in accordance with 14 CFR 21.191(i)(3)), the following steps must be completed:
Complete a new 8130-6 (Application for Airworthiness Certificate.. Example attached)
Create a Program letter. (See FAA Order 8130-2F, page 221 for an example)
When I went to the FSDO to complete the task, they wanted me to bring.
My air airworthiness certificate for the airplane and current flight restrictions. (These will be turned in and you will get a complete new set for elsa)
My aircraft/Engine log books showing the aircraft is current. They also wanted to see in the log book where I completed the last AD.
I printed the page from Flight Design showing all the aircraft & Engine service bulletins, which ones applied to my plane and the dates of completion. (He only looked up the last one in my book).
We went through the paperwork to verify is was all correct.
He gave me my new airworthiness certificate & flight restrictions (One significant difference when you are elsa, you can no longer fly over heavily populated areas as an experimental aircraft).
Before you go to your appointment, ask what they would like you to bring just to be on the safe side.
A friend of my who went elsa ended up with a 5 hour phase I flight restriction of 100 miles.
You will need to placard your aircraft. Where to put the "Experimental" sticker, I found this in "45.23("
I hope this helps
8T8 - San Antonio