ok sorry if this isnt posted in the right spot but i wasnt quite sure so feel free to move it bosses

basically i have decided i want to go with the split trunk but i havent undertaken a job of this size as of yet. this stump has been posted on this site recently and as i have had positive feed back to my idea i think i am happy to go with it.
what i am asking is how and what sort of proccesses would be the way to go?
would i be best marking out where i want to make the hollow out, and then create a shari to suit first before going into the carving side of things. i eventually want to get through all the way too create a twin trunk.
is this going to slow the ramification proccess dow by sending its energy to healy the cuts and chops?
would i be best waiting for the shari to heal over before going all out and taking this trunks "meat" out of it?
i am hoping for a more dynamic and exciting look. i have posted the pictures again so you can see what i am working with.
i am hoping those with the experience of chopping, splitting and carving on chinese elms can help me out here. as much info as i can get will be greatly appreciated!
so i am calling on all you experts out here as this will be a bit of a learning experience for me, and the last thing i want to do is mess up and have this tree die
