I'd be very interested in seeing (at least) the pictures of the coal baskets used... for ideas.
I tried to burn coal in my D-16 last year and didn't have much luck, but I was never certain whether my draft was inadequate for coal, whether the grate was too small or whether the operator was just inept. My grate is not the original RO grate... it works fine for wood, but jams readily on small bits of coal... making it almost impossible to shake down a coal fire.
I'd like to try coal again at some point, but not until I've got a grate that has a chance of working better. (I still have the original RO grate, but frankly I don't think it's much better suited for coal.)