Just like the head assembly, the carbon main frame came pre-assembled out of the bag as shown in the photos below. The frame is the typical double stacker carbon plate design found in T-Rex 450's. Combined with machined aluminum standoff, the frame forms a very rigid structure to withstand the force exerted by aggressive 3D flights.

Not much needs to be done with the main frame. The assembly starts by mounting the 3 cyclic servos with the included screws and plastic threading nuts. It's a little tricky to hold the plastic nuts inside the frame due to space restraints. Make sure you work on a towel or area where a lost screw is easily locatable, since they are extremely small.

Then the head is inserted into the frame's main bearing block through main gear. Unlike the traditional through the shaft bolt method of fixing the main gear, a tiny screw is threaded from the end of the shaft at bottom to hold the assembly together. The access hole on the bottom frame plate allows this to be done with ease.

The typical proven T-Rex landing gear design is utilized in the 250 kit, but in a much smaller scale. Nevertheless Align has included the same end caps and rubber stops with this kit. The skids are held in the plastic bows with drops of glue.