[quote=JNCT14]OK -
I am a pretty experienced quilter, I know the design, I calculate my own yardage, and I don't need directions. However - do I still have to buy the kit?
Now note that I would not sell the quilt after I make it.
You're under no obligation to buy the kit, nor to seek permission. Go ahead and make it. The only way you'd be in trouble is if you tried to sell it or a picture of it was published or perhaps, if it was entered in a show.
If it assuages your feeling of wrongdoing, ask if the pattern is available and if it is buy it.