hey weedhound ,
yep i drilled all the holes to like a 1/4 in. diameter and added lots of extras too . word of warning tho keep all holes away from outside edges of the top pot , the roots being really close to the edges makes it a p.i.t.a to spin the top half as roots wanna get pinched between the 2 halves when you set it back in bottom half to rest .
peace
crispi