Ill try and explain these parts as best i can, some are fairly obvious others I'm not quite sure of but hopefully will become a little clearer when the manual arrives. The triangle is the base with axle for the wheels, the round black steel part holds the gas bottle in place on top of the triangle, the 2 pronged piece with nuts on the end is the front leg, the square metal piece that your holding in the photo is a cover that fits half way up the side of the cylindrical stand,the knob with weber written on it is for controlling the flame and the tube it's attached to sits inside the cylinder and the burner with the SS shaft with knob attached sits inside of it. The knob is used to shift from indirect to direct cooking positions
I hope that makes sense
Brian if your happy to part with those parts I'm interested
I'll send you a PM
Cheers
Joel