Mill or crosscut
You really want to mill something that big? Seeing as how I don't have thousands of dollars of 7+cube saws kicking around I could beat on, I'd look for a two man cross cut saw, hire a beefy teenager (or two), and crosscut it and make slab tables. The bonus of handsawing is the slabs come out real nice, almost finished. Just be real cool on your cut to keep it even.
The reason I know this is I got given a huge dead elm that size way back in the day and that's what I did with it. Nice all summer long project cutting that thing up in my "spare" time, tell ya what. And, it builds manly man arm muscles. The slab tables that size are worth some good coin if you can finish them off with like gnarly branches as legs, plus you can inlay them, which is the $ecret to differentiate yourself from all the other slab tables out there. Work with the customer on what they want for a design, use your imagination, colored stones, various wire, seashells, busted old leaded glass pieces, or other colored glass chunks, you name it. Other sorts of exotic and colored wood scraps, tons of customization possibilities there..
I'm planning on doing it again once I find a good enough one man saw locally to me, I am under no illusions of getting anyone to help with the other side, though, tried that. With enough cash though, you might do the teenager trick. I didn't at the time, tried the "ask a friend, here's a six pack" routine, that didn't last past one cut. Man, them big ole gnarly ones with loads of branches make dang nice tables though.
I looked in my area, already two dozen people are sitting on stacks of milled pretty wood..that market is saturated for woodworkers looking for lumber, at least it is in my area. The only milling I am going to do is just pieces for myself, to build something with. I am not going to all that work unless I can do "value added" enhancements to what I mill or cut.
