I don't see any problems using a single chain to anchor all the turnbuckles to. As long as it can handle the load, of course. A single anchoring point [chain] seems to be the more elegant and neater solution to me.

I must include the disclaimer that I am no expert and am just passing on info gathered from others with much more hands on experience than I will probably ever have.

Maybe one of the more experienced tower raisers will toss in some info.

Good luck with it.

Tom