Looking further into the Nylet site (which Mattias) mentions above, they make sails in cotton for vintage yachts and also offer a restoration service. The material most model yacht sails from the past were made from was Union Silk, this hasn't been available for many years. An excellent item on painting and finishing is in the Members Contributions section of this site, written by Paul –
**LINK**
The rules for the 36R class state the model should fit in a box 37" x 9" wide x 11" deep –
**LINK**
The Vintage Model Yacht Group may provide further help –
**LINK**
Your model is fitted with a Braine Quadrant which was an early type of steering mechanism

Good luck with the restoration and keep us posted.