I think airplane kits are different from plastic car/truck kits where everything is made to fit together. I rarely use the hardware included in airplane kits, it is often too crude or heavy and as it is rarely a drop in fit you might as well use your own favorite hardware.
In fact the best kits are short-kits where you get a drawing and the plywood parts etc. readymade, but for the rest you use your own wood and hardware.