DF65 boat kits and parts are available from Hobby Warehouse and we have members that can make sails for you if you prefer.
Please speak with one of our senior members to find out what's best for you.
Link for Hobby Warehouse https://www.hobbywarehouse.com.au/joysway-dragonforce-65-v6-df65-rc-yacht-rtr-includes-transmitter-receiver.html
Avalon Sails 1/44 Panton Road Greenfields, Mandurah WA 6210 is the place to buy tape to seal your deck hatches. It comes in sheets that you can cut into strips as you require.
Cutout Plastics Unit 3/39 Reserve Drive, Mandurah W.A. will make sail number stencils. These need to be 100mm high in Arial Font.