You could approach this from the opposite direction and use the flat side as a platter and carve the limbs into equal length feet to set it on a table.
This would be similar to large root balls that are made into tables with the roots being the legs. The difficult part would be supporting the piece while turning the platter side of the piece. You could drill a recess or glue a tenon on the flat side and then mount the piece in a chuck then turn all of the legs to the same height and then glue a flat round board to the feet to allow reverse chucking on the flat round board and then finish turning the platter side and then remove the flat round board and finish carving the legs. If you are looking for a challenge which the piece you have chosen seems to indicate then this would definitely add to the challenge. This method would provide the largest surface area of figured grain available in the piece you have. You could also just cut all of the limbs off and turn a flat platter which would also maximize the figured grain you have to work with,