Love these tandems.... I restored one a few years back and about to buy another... Here is the one I had from years ago, should have never sold it so beautiful.
https://www.flickr.com/photos/131254637@N06/page7
not sure what other folks are saying but originally there are 26 inch rims on it, pull brakes front and back side pull... although the back brakes are a POA and needed these weird extensions. I never tried 700 wheels but they might work... maybe.
you can see it had fenders and lights etc. Coolest thing are the cranks which are beautiful and a campy tensioner real interesting.
these things where ALWAYS a three speed. cheap chrome plating probably is the reason why they rims were swapped.
Good luck and send a pic when its done!