To post pictures here, you need to have them uploaded to some other picture hosting site. Once uploaded there you can insert the photo image tag in the body of the post and it should show.

Traditional timber frame design has the plates above the post so that the rafters sit on the plates. Having one layer of timbers going from eave wall to eave wall (the tie beams), and other layer of timber going gable end to gable end (the plates) creates a "grid" of timbers that makes the frame very ridged.

If you join shorter timbers to the sides of the posts (interrupted plates) this is more of a modern design method.
As long as the joinery is strong and true it may work for you.

Jim Rogers