I have no clue about a panel, but I was surfing around and found this site
http://www.nativeamericanstarquilts....canDesigns.htm
seems they have a pattern available (scroll down, it is item #8). Haven't dealt with them, but maybe someone else has. I do believe there is a block called "end of the trail", so maybe you could combine that with the centre medallion. Anyway, keep us posted and let us know how you get on.