Drew, almost... you have most of the info, but the verts actually have the X pan brace and they have support bracing that comes out from the center of the car to the outside edges of the floor pan, directly in the way of the subframe connectors.
I've heard some talk that a couple companies may or may not offer a vert SFC, but haven't followed up on that yet.
What I did is build my own with the main tube being 2"x2" (instead of the 1"x1") and 1/8" thick and notched this section out where this brace protrudes. You could get a set of coupe SFC's and mark out the area needed to be notched, and then take them to a shop, have them cut out the notch (or you could do so with a hack-saw) and then have them box and weld the notched out area.
This was going to be my second choice... but the ones I built are pretty stout! I could send you some pictures of them if you like or need?
Just let me know! - Brett - 67 Drop Top 455! brett@cisdirect.com