Hi Cam
Do you want to sail her, or put her on the sideboard?
As there appear to be no hatches, conversion to RC would not be possible without putting on a new deck. If you are not up to that.
She could easily be turned into a pond sailer. Where you find smaller boating lake, you stand on one side and your grandpa catches her on the other. It may also be possible to fix self steering gear (Brain gear). It would be useful to see close up photos of the stern, rudder and transom, to see if this has been done before.
You could turn her into anything you want. The hull dimensions may not be correct, but the sail plan is what most people will see (above the water). Balancing the position of the mast, the forces of wind on the sail, the lateral resistance of the hull (as the wind tries to push her sideways) needs a bit of planning; but it is not rocket science.
If you want to know more about this you can ask on here. But I would highly recommend a book that covers this and more and it is only 12.95, and so not expensive.
Radio Controlled Scale Sailing Models by Phillip Vaughan Williams. Available from Traplet.com.
The Traplet site also has photos of models on the plans section. I am not suggesting you buy a plan but the pics can give your further inspiration.