The best parts were that the bike was on a rural property and I had a full tool kit with me... so I unbolted the rusty cart and left it behind on the farm ... and the frame was undamaged by the addition of the cart - the cart was simply bolted onto the frame without any alteration to the forged drop outs or to the top of the seat tube.... and the price, which was $20 Canadian (about $15 US).

The front seat tube is 23 inches (58cm) and the rear is 21 inches (53cm).

The Cambio Rino seat posts required a bit of penetrating fluid & persuasion to get moving (Acetone & ATF) but other than that, and the fact that it needed a rear wheel, an entirely rewarding and extremely low-cost fun project.
I have no one to ride it with so I ride it solo.