@DaveR knows a lot about woodworking, I know nothing, I think he proposed something like this, please correct me if I’m wrong:
Using followme tool to apply the profile of the inside curve over C and D and then
Using followme tool to apply the profile of the outside curve over A and B.
Then select all and intersect faces with the selection and then remove extra geometry.
with this result
This is my .skp file if you want to check it.
tableleg.skp (69.4 KB)