Don't do anymore tillering until you have a tree and a gizmo to run up and down the limb to mark the high spots. Then a palm sander is in order also, you wouldn't believe how uneven the limbs can be till you start running over them with the palm sander. It made a believer out of me and I thought my scraping was as flat as Kansas......how wrong I was. The scraper leaves hills and valleys then it ends up like a wash board, you can't hardly see it, and you can just barely feel it, but it's there all right. The palm sander will take care of that.
Take a look at some tillering trees that other guys are using and you can get some ideas of what style you want. Mine is simply an oak board that was begging to be used for something with holes drilled every inch out to about 32" and I use a 3/8 wooden dowl for a peg to move from one increment to another. Then I screwed it to the wall inside my garage at about the height that was comfortable for me, be sure to put the screws in a stud so they don't pull out.
It's actually more just a tillering board that's screwed into the wall and not an actual tillering tree, but it is whatever you want to call it. Same basic principle.
Here's some close up pics of mine.