I used to have a C. citrodora, lemon scented gum. Kept it going maybe 5 years as a outdoors for summer, indoors for winter bonsai. Lost tract of it during a health issue 12 years ago. No longer with me.
They are easy. I would hold the seed, dry and in refrigerator, and start it in late spring when you can start it outdoors. But you can start it now if you want. I would winter mine under lights, with my orchids. It was a fast growing, tree, that would not branch much, at least initially. It does bud back well when pruned. Long narrow leaves reminded me of a willow. But growth habit would say it is NOT a candidate for weeping style, this tree will want to be upright.
I see no problems as bonsai, except "going big" somewhere near 3 feet tall would make it easier to get proportions right for leaf size and long inter-nodes.