The issue with fabricating an all new headliner is the length and width of that 37 sedan. There is not any material I know of that is big enough to cover the whole roof with one piece. It takes someone a whole lot more talented then me (which may not be hard to find ) to join more then one piece and make them look right.

www.automotiveinteriors.com had headliners for my 39, they may go back to 37. Gene