Usually I don't comment on these threads, because everyone should use his macbook the way he/she prefers, but this is just crazy. If you are scared that much by possible scratches, then maybe it's best to leave the macbook in the box!
To also contribute something useful:
I wouldn't put a skin under the case. The speck cases are very tightly fit to the MBPs, I've actually read about a few people that damaged their MBPs because they were not able to remove the case without brute force (also using a screwdriver on aluminum is stupid of course!). Anyways, with a skin, the case might not fit properly and actually cause more damage.
Use either the speck case + a nice protective sleeve, or the skin and a nice protective sleeve.
I assume you have keyboard cover and palm rest skin? My MBP has started to get a bit shiny at the edge of the palm rest, where my metal watch touches it regularly. So if you care about that, you have to protect it all around, not just the outside 😉