Attach the front and rear arms to the bottom plate.
you will need 4 x M3 x 30mm screws.
Because I could not find 40mm nylon spacers I used 2 x 20mm.
Mount your FPV camera, flight controller and rc reciever on the clean section board. To mount the flight controller I used 6mm nylon spacers. The RC receiver is fixed with tape. I use is a board cam that I mounted on to the board with a 3dprinted part. This can be attached to the clean section board with two 6mm M3 screws (drill extra holes in clean section plate) or just glue it to the clean section board with some epoxy.
Then mount the clean section plate on to the frame with 6 anti vibrating rubbers.
Last step is the top vtx plate. Before mounting the plate to the frame first attach your video transmitter, on screen display module, and vtx antenna to this plate.
On my multirotor I used an Immersion 5.8ghz 25mw video transmitter in combination with a Immersion spironet antenna. And an HK E-OSD module. I just used some tape to attache everything to the plate. I also isolated the open copper parts from the vtx antenna.
Then mount the top vtx plate to the frame with four 6mm M3 screws. The vtx power cable comes out at the back and can be connected to the battery. The video cable goes down and can be connected to the camera.