Skinny chimney - lower portion bricked

I love the long skinny chimney on this build, but mine will be assembled in two pieces - one under the roof and one on top. I have the lower portion built, bricked with egg carton, painted and grouted. Here it is in progress, before the painting and grouting. I left space in the siding application so the chimney would sit flat against the plywood base. I'll add trim to cover the remaining gaps.