..without meaning to be provocative (..i'm aware some carpets sets can be 'challenging'..), carpets look like to be a good fit. where did you get them from ?
These were from Newton via minispares - thought I would get the best I could find .... hmmm
They needed A LOT. of cutting , tweaking to get close to a good fit on curves and angles and general size. There are no holes for anything ( had this discussion .... perhaps they need to provide a paper template for different permutations of Minis to make it easier)
Thick ‘underlay ‘ attached to back of carpets ( although you have to remove areas when cutting carpet)
Moulded for tunnel
Pop Clips to hold main sections down ( I didn’t use)
Seems good quality and lovely colour
Challenging ..... YES , very much so .... worth it in the end