Need ideas for interior trunk panelling.

Try some 1/8 melamine/fiber board, use a fabric or carpet from where ever. The biggest challenge will be to secure them to the sides. Use some cardboard to make templates, I used some Cardboard to make my speaker box fit tight before the carpet went on, now that it's on it is really tight.LOL

Tom

You could make all the panels and then bring them to a fabric/upholstery shop and have them do something with a design for you. Should save a few bucks and keep your car at home.