Hi Sandy, thats kind of it yes.
There is a plate on each side (A12 on the Shell Expansion, i'm sure you've seen that at Mitchell?) which do 'curve under' as you say, they come down one each side, and are riveted to the stem which is 4x1'' which rises from just in front of frame 111 forwards.
It is the part where the plate is riveted to the stem, and those (Keel 11) that are part of the flat keel join/merge that i am having some issues with.
I am hoping to be able to build my model out of tinplate, although even if that isn't possible it will still need the plates to be just right as they will be thin plastic on wood.
This photograph of Richards, does show an amount of shape to those A12's which I had hoped it would, the only way I can get my lines to work is with quite a bit of shape there, so it has really helped with that, but I still ideally need a pic of that exact point where the Keel11 joins the A12! (Hope that makes sense!)
There used to be an excellent close up photo of the same part of Waverley's forefoot on the PSWaverley.org.uk website but it seemed to have gone recently, it might have helped, the two sections are not identical, but pretty similar.
Might have to make a mock up with balsa and plasticard to fully understand....
Cheers!