Seems ther is large difference between yours and this white cedar: this one is very dense, about 0,6 SG, maybe more!!! I do not know how it will hold but it is like iron pipe- totaly unbendible and strong 1 1/2 x 1 1/2.
I will have no mercy for this stave, treating like the best ash.
Will see.....
P.S. I found it on translator- thuja occidentalis is whitecedar, right? Here it almost never grows thicker than5" in diameter.