J, I don't think may people use a supporting block in the form for any type of cutaway. All 4 of my guitars to date have been cutaways and all of them florentine (that's the pointy one just to clearify).
Just lay it out on paper and bend your side to suite the layout. Than make your blocks (head block and cutaway tip block) to suite the layout. Than glue the cutaway side to the lower side (just like Bruce Dicky's jig) but I do both pieces in the caul at the same time, makes it funner (is that a word). Than glue the sides to the tail block and head block in the form, there you have it.
Here are some pics of the bending form I made, similar to that on James Olson's site, only uglier, yet it works well for me.
Here is the finished (well bound anyway) cutaway. Just need to go slow with the mitring.

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