Thanks for your reply.
I was just trying to use the lid from my functional weber. I guess I will go and find a lid from a junked weber.
But what about the heighth of the cooking grate from the fire box grate? I still need to keep that at 24" min. So if my lower grate is at 6.75" from the top do I really have room to put the second grate? Should it be like 1/2" from the top?