Hi there, new to the forum, treat me gentle

I'm thinking of removing the spare tire from my car (replacing it with a repair/patch kit) to gain some extra packing space. Have you ever seen a boot liner that extends down into the room where the spare sits. One that lets you utilise the space there ones the spare is removed? Something that that looks factory made/crisp/like it should be there.

Used google kung-fu to the best of my efforts, no dice.

Have you thought about using thin mdf or fibreglass to create something then cover with automotive carpet?

I've never constructed anything like that before. Should be doable, but would rather there be something already made