1- Use 1m Alu profile with cross section of 15*15mm .
2- Cut it to two pieces (2* 0.5 m).
3- Make a cut in the middle of them as it shows in the picture.
4- Put them together by using two pieces of fibreglass (4mm) and 4 screws ( 25mm* 3mm)
5- Mount 4 screws (75mm*3mm) on upper fibreglass for creating and structure to mounting electronic later.
6 - Use a cloth hang like the one it shows in the picture for the legs. Dismantle it to get arms out of it.
7- Drill two holes on the frame as it shows to mount the legs.
8- Mount the legs with using one 20mm*3mm screw.
9- Drill holes on the frames for mounting the engins as it shows
10- Tight engines to the frame by two screws. Use the plate which normally comes with the engines
between engine and frame. It helps to keep the engine straight in position.
10- Use 2mm fibreglass plate as two other levels and put the in place by two nuts. Flight controler board can be mount in the first one.
11- Use velcro strips as it shows to prevent of slipping the battery during the flight.