It was certainly not my finest hour. Part of the problem was that the size of all the parts increased by the thickness of the material, so everything became a very snug fit - upon refitting, there ended up being some movement in the Alcantara and it ended up looking crap in places.
One way around that would be to reduce the size of the original parts by the relevant amount. If you imagine the Gen 7 central fascia, for example, you'd look to remove 1mm of plastic from every single edge in a bid to ensure that the fit was spot-on once it was all trimmed.