next is to pour the plaster of Paris
add wood pedestals to the top ( this will keep the plaster mold off the vacuform table for a better conformity ).
after it is dry, use hot water and fingers to break/melt the paper mold away.
and here is the initial plaster canopy plug.
and light sanding, it needs fixing where I left the internal frames ( next time, when the tub is dry, remove those before pouring the plaster ). I had to gouge them below the surface and add putty. Nothing major though.
putty repair and all is well. sanded and smooth.
Isaac