The tonebars have been discussed over and over for years. The general consensus from a luthier population has been that it doesn't make any difference (with one exception). One well know luthier even reported one mandolin sounding better after having been switched. An F would look silly reversed, an A is no problem. This really is not a new discussion.
The biggest problem after the nut and the bridge is the side dots and they aren't all that hard to do. Frank Ford actually has a tutorial on www.frets.com.
By the way, the old Gibson oval hole mandolins were not X braced.
Here's one thread that pretty much sums it up. We could dig out more.
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