Skulltrail mobo? Sure, I can believe that. There is indeed one on the market, even if it is $650.
8GB of Corsair? Again I can believe that. Corsair does make 2GB FB-DIMMs so you have enough room for those. Only $320 for that.
Here is where you screw up...
3.3Ghz quad core? Doesn't exist. Perhaps you mean 3.2Ghz? That would be the QX9775 which currently retails for $1500. Oh but wait, you have skulltrail? That's a dual socket system! You'll need to buy two of those $1500 processors. Overclocking it to 4GHz if you actually had such a system is well within reach.
As for Tri-Sli? Not possible. The only skulltrail mobo out there doesn't support tri-sli.