I don't have a DV8R but I built a smaller model based on PCM's version.

According to their instruction book there are no flap servo pockets, the servos are:

The two Flap servos are located within the gear bays. The 4-40 pushrod runs underneath the gear leg (when retracted) and passes through the balsa sheeting and out to the horn located in the top of the flap. The Flap is Bottom hinged.

Also:

The servo is located between WR3 and WR2just in front of the retract air cylinder. The horn is oriented towards the top sheeting as shown in order that the pushrod has a straight shot to the control horn.

PM me if with your email you want a copy of the instructions, it's a PDF file. - John.