Plaster casting a ceiling rose / medallion, DIY without expensive casting products

Making a large ceiling rose ,rosette or ceiling medallion as they are called in America. The full process from sculpting the pattern in clay to casting in plaster without using silicone or polyurethane moulding materials. The design is a little quirky incorporating two green man faces with oak leaves but it is a long envisaged design that I wanted for our own house. The only real expense in the plaster of paris, I don't count the clay as that is re-usable, so it makes for a cheap DIY project that gives the results I was after. The process include making the mold /mould and using easily available materials for the mould release between the plaster mould and the finished plaster casting. It shows tips on mixing plaster of paris and the ratios to use as well as how the plaster hardening process works. The video ends with me fitting the finished ceiling medallion / rose. If anyone really likes the design let me know and I'll see if it's worth getting some made for sale.
0.00 Clay pattern modelling
1:08 Casting the mould /mold
4:42 Casting plaster on plaster mould
7:10 Second casting and demolding
8:40 Fitting the finished rose / medallion