Hi Myndertp,
I bought the skylight at Amazon, I believe it's the exact same as Jayco uses in their new trailers:
https://amzn.to/2gCU2pR
I did do the install myself; I emailed customer service for a roof framing detail for my JayFeather and they were very good about sending it quickly.
Not sure if you saw my install video:
https://youtu.be/1yw7sMAeokM
If you have any questions I'll be happy to answer, we can talk on the phone if you want.
Bob