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Ha sorry, no I don't. My LBS did it.
I've just removed the topper to see if a headset spacer fits and frustratingly all the ones I have are fractionally too wide. They almost sit flush with the outside of the topper, and therefore obviously don't fit inside. Probably wouldn't be beyond someone with skills (and a lathe) like @hoops has pointed out to make something that would work.
I don't have Vernier calipers for an accurate measurement but the crude ISP diameter measurement I could take with my tape measure says 32mm. The LBS have done a nice job of a clean square cut.
yetidamo
@user61255
I'll have a look in to it as Giant use ISP spacers to raise the height too. I think they just rest on top without a lip.
I don't suppose you still have the 1.5cm bit that you cut off?