At the very least I'd say some cable tensioners on the HT, maybe those nice brass ones?
Where could you get these cable tensioners?
https://www.bricklanebikes.co.uk/via-sti-cable-adjuster & https://www.bricklanebikes.co.uk/via-downtube-shifter-mount or http://kirkframeworks.com/models-and-accessories/brass-derailleur-adjusters/
May well be able to find something on ceeways too
http://www.framebuilding.com/
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At the very least I'd say some cable tensioners on the HT, maybe those nice brass ones?