"Trellis step though frame" would be a better title.
Do some reading about frame geometry and consider your chain lines.
There's no way there would be an advantage but it might look neat.
Maybe try playing one of those bridge building games too, you'll get a better idea of the physics involved in a building a trellis structure, then take into account the forces the frame will be seeing into your design.
If anything it's fun to draw moped frames.