before attaching the top piece of wood to the base, I drilled up from underneath and than into the bottom of the pvc. you can't see the screws but ther inside the pvc sticking up
nah they're crooked for a reson, you can see in the other picture that the bottom is two 2 by 10s sandwiched together. if I drilled straight down it wooda split the "sandwhich" apart making it break or be a lot less sturdy