I don't understand the plans. So the green is where you put your esc and red your batt? also when it says 'and crush the paper around the line" how do I insert the batt?
Battery is in front (green in your pic)
Electronics, behind the battery.
In the purple areas on the left/right fuse remove the paper, mash the foam to make a shallow pocket/cavity. Glue the center fuse to the right, then remove the shaded areas for the electronics and battery.
The mashed areas and cavity will make a pocket wide enough for the electronics/battery.
Put the eletronics in before glueing the left fuse half.
The battery will slide into the cavity from the bottom. I add duct tape to the sides of the battery to make a tight fit. Or after inserting the battery you can tape over the hole to insure it stays in place.
The idea is to "hide" the electronic/battery and give the plane a little cleaner appearance.