Do you have the sail and is it in good condition? If it's good then it should be easy enough to replace the missing parts. If you don't have the sail you will either have to have one made for it, make a polysail, or convert the rig to something readily available. Converting the rig will force changes to the rudder and board shapes.
You can get all the dimensions from the pics Sunbird provided. The boat has a draft of 2'4" with the board down and 4" with the board up. So the board length is the depth of the trunk +2'. The width is a little less than the trunk width. The thickness needs to be narrow enough to slide in easily. Be sure to allow some room for the wood to swell or you will end up with a stuck board. At a minimum round the edges. A foil shape with be much better for performance. The rudder dims can be scaled from the pictures and the known board dims. Pintles can be bought online. You can pay a lot or you can pay far less. I like the Racelite brand.
The sail dimensions are: Luff 9.5', Foot 6.83', and leech 10.42'. With these you can figure out the mast length required.
The rigging is easy. Just see the pics. Since your daughter will be sailing it, tie an empty, capped, jug at the top of the mast. Like the boat fender in the pic. This is to stop the boat from turning turtle when capsized.
