Charnel Throne footprint for Custom Terrain piece?

Looking to build my own Charnel Throne out of old bits I have (bunch of old world skeletons and other bone bits). Only problem is I don't have a 3D printer to print one or know anybody who has one to trace it out.

Would anyone be able to share with me a to-scale outline of the footprint? That's all I need to start working on this piece.

Thanks!