Put this together today as well. Still to be soldered but seems to all fit ok.
The condensor is 1/2 inch copper internal with a 3/4 outer jacket. The outer jacket is around 630mm long.
Connection to still will be via a 3/4 ss ferrule and triclamp connection.
Water inlets and outlets via 1/2 -1/2 - 3/4 tees, with a small 1/2 copper stub in the tees to be soldered onto a 15mm brass threaded tube bush.
When hooked up to the pot head inlets and outlets will have a 20 - 15mm brass threaded reducing bush screwed on so a standard hose connector fitting can be used. For reflux the outlet of the leibig to the inlet of the reflux condensor coil will use a standard 1000mm long "cistern type" water connection line with 1/2 inch fittings.