I am trying to build a 3d printed v2 but the scale size of fins require too much nose weight. In order to reduce nose weight I plan to place the engine recessed and use holes at the tail section to decrease Krushnic Effect. Orange area is the engine mount. I read the apogee newsletter but confused about design of holes to allow ambient air to enter the body tube. Attached images show the design idea and asking help of experts to make it work.