Here is a picture of my headliner in my Baywindow campervan. Ignore the grining idiot thats me



So my thinking is to remove from campervan, it's going to be quite flexible when I remove it so some sort of frame would need to be made for it to hold it rigid.  It is material surface so I need to cover it in something so the mold doesn't stick to it.  Suggestions on materials to use for this and also what to use to make the mold.

I realise that what I put on it won't give me a perfect surface but I would need to take a part from the mould early on and modify it(materials to use for modifictions?ie.Foam/GRP) as I want to put speakers in it, nothing huge just 10cm speakers as I don't like them in the doors.  Also to remove the indents for the handles, I don't use them anyway.  I have a pop top fited aswell this has a wooden frame that goes around the roof you can see it in the top right corner of my picture I would like to blend it into the headliner for better asthetics. Once I had done that and got it shiny and glossy then make another mould from my modified headliner.

This would be the mould to take my final modified headliner part from.

Is this the right way to go about it,? Did any of this make sense? It is attached through holes with plastic bungs originally ideas on hidden fixings for these as the front is held on with the sunvisors which are screwed.