I Designed this Turtle Deck Hatch Cover for my FT Mini Corsair to replace the paper one. This hatch just glues on with hot glue. My 500 or 800MAH lipo battery slides down through this hatch and inside the power pod toward the front. If you print this you will also need a couple of small plastic hinges (10x28) that super glue on the back side, I got mine from here---- https://www.banggood.com/10Pcs-Square-Hinge-Plastic-RC-Hinges-28x10mm-or-34x16mm-For-RC-Airplane-Aileron-Servo-Accessories-p-1566289.html?rmmds=search&ID=514322&cur_warehouse=CN

The hatch added a bit of weight just behind the CG so I printed this Power Pod with the angled front for my motor. https://www.thingiverse.com/thing:1096211. I also needed to add a few grams of fishing weight just behind the motor to balance the CG. Anyway, it fly's great once in is all balanced, and definitely looks better.