No. If you look at the drawing, the hole is 1,07” deep.
It’s not dangerous at all; you first drill a center hole and then proceed with the square X/Y movement, removing 0,5mm at each pass. DRO is your friend.
But it’s quite slow, of course. You'll need watchmakers patience. Biggest problem is evacuating the chips from the hole; working at home I cannot use high pressure coolant.
Anyway, I’ll make my parts
With a П-channel where the spar is glued. I guess the channel will be something like 40…45mm long. L