When I rehabilitated my MiGi TD I tore out orange shag carpet that was glued to the entire interior except the door cards. I used marine grade carpet that will standup to getting wet without the smell that normally occurs with wet wool based carpet.
Initially I used double sided carpet tape but found that cleaning the floor carpet at end of season was a problem. I used a snaps on the floor to prevent them from sliding/moving. I used two sided tape to attach the carpets to sides and under the dash. I also sewed bias type tape to finish the edges of the cut carpet to prevent it from fraying. The bias tape was made from same vinyl I used when I made the seats
David B Dixon
Port Perry ON CA
Sabine