Just had a look at the pic again.
Mate or no mate- the installer was a nipple head.
The holes will probably be too close together to weld up; you'll have to get a plate the same shape and size made up and welded in it's place.
And what happens when someone tries to steal the wing? or you need to get it off? New holes again???
IMHO, if you can afford a 10K stereo, in hind sight you should have spent $300 getting the wing installed properly - that way you don't have to spend $300 fixing up the fcuk ups!
As an aside, I've always wondered about the large wings; if they just bolt into the boot skin, there is no way they will provide "downforce" anyway - they'll just bend the sheet metal of the boot. I haven't looked at how a factory R34 GTR wing is installed; but I can bet it bolts into the boot reinforcement frame in some way. Hope your boot lid stays flat over time!