Yep, the holes are tight. This is for the first batch only, the manufacturer struggled to cut the 4mm carbon and I think we wore out his tools... but we'll be fine for the next batch made.
What I did, is use the Losi tap screw (the silver one) to screw in each hole and over tighten to strip the threads. Then I run a normal 4-40 with a 3/32 head (because its less likely to strip the screw head than a 16th) through the holes and work them til the screws are loose.
No harm in redrilling them, but don't go mad, if the screw rattle in the holes its useless.
Chris