I got few of these dropped on my lap, from family, like you from nursery stock. So I have been researching them to learn what is possible. I am assuming you bent the trunk, as most are straight, and wanted to do similar to your in bending and of course, push the envelope on what can be done.
Any other hints, found they love moisture, hate wind, and need a good amount of consistent pruning. The dead stuff, which is why I ended up with it, haha, was pretty extensive, but then again, we need to thin out majority to get to the trunk anyways.
Your tree has given me hope, well done, and nice nebari as well. If it helps, I was thinking of slabs as well. I try to make them and we'll see how they come out.