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Well done, good work!
The racier/best quality tubesets take a 27.2mm seatpost. My guess is that you need 26.4mm, but obviously measure first.
One thing to bear in mind, is that the ears of the clamp tend to pull the tube into a slight heart shape at the slit, particularly if it's been over-tightened. So the correct size post might still need a little effort to get it in.
This is what causes the characteristic zig-zag pattern you see on old seatposts. It's also why people mount the separate clamps you find on modern bikes back to front and why some manufacturers put the slit at the front of the tube.
And you can safely mount a freewheel on the fixed side of a hub, no hacks required.
Scilly.Suffolk
Almost finished on this, learned so much thanks to everyone. I'm already looking for other projects to have a go at!
Turns out the seatpost is NOT 27.2mm as I thought it was. The one I bought was much too large in diameter and until I manage to measure with some verniers I am stumped as to it's size!
Looking for a freewheel to go on the other side of the hub. The hub if a fixed fixed one...is it ok to put a freewheel on those? I understand that the fixed hubs have less threads for a freewheel...any hacks I can do?