I assembled several C-16's years ago both Hon3 and On3.
I used a 250-400 watt gun as well as a resistance unit.
and a butane torchThe resistance was much easier.
which ever iron you use, you need to get some aluminum wire.
That holds the parts together but will not solder. Look for it.
It's around still. Get the 1/16 wire if you can find it. 1/8th works in a pinch.