Sekka is a slow growing Hinoki, style by subtraction. If your plan requires it to grow out here or add a branch there, it will take a long time to grow. That little tree in front of you could be more than 12 years from a cutting, possibly quite a bit more.
I'd go parent-child, two trunk design. The more slender trunk should be one third or two thirds the height, never exactly half the height of the main trunk. Why? Visually it works.
The branches of 'Sekka' tear away from the trunk easily. Only wire late autumn, and be gentle doing wire. I screwed up one of mine with clumbsy fingers & copper wire that had not been annealed sufficiently. It has since perished.