Print your favourite parts to complete your design.  Take some carbon or aluminium square tube of 10mm x 10mm. Length is what you want. For the Spider the correct lengths are in Spider.PDF. Then with some M3 x 20 and M3 x 25 bolts, washers and screws you can make your multi-copter frame come to life.  Place your beloved KK2 or Multwii flight control board, an other board may need some DIY, on the bottom plate with 5mm standoffs.  Screw some motors on. The motor mount are designed for 28mm with 16mm and 19mm screw holes. It is possible to mount the motors upside down, on top or from the bottom.  Zip-tie the ECS's on the arms, connect the to your flight controller and motor.  Program the flight controller and mount your receiver on the back or front for the Spider.  Place some Velcro band through the bottom plate. A slit in the bottom plate is made for this. Place your battery on the bottom of the multi-copter and balance it.  Update parts: - Leg Base - Leg Plate - T-Couple (60) These parts are update for a better fit of the nut. The space between the center and edge of the M3 nuts is gone from 2.5mm to 2.75mm.Happy Flying.