Thanks for your reply guys ! Would be great if you can code it @Bastien_Siebman !
I don’t expect any custom design, the Asana design would be great.
My goal is to create project in Asana → Show the available project to freelancer so they get all the info and they know what I need. It’s read only, they can not modify anything.
Then once I hire them, they create an Asana account and we use default asana features to handle project management 
If we can make it, and if I can request something …
It would be ideal to hide section : in a public project, I can choose to “show all”, or hide some section available only for registered users.
→ it will allow to share the link publicly, and freelancer only see the available project. When I hire someone, I move the task to a “In progress” section hidden from the public (so people doesn’t know what we are working on, they don’t need to)
I might ask too much but it would be ideal 
Thanks for the consideration guys,
Martin