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jeff80
clubman
You were lucky to find those Chater spindles.
When you re -assemble after refinishing, you must make sure that there is absolutely no possibility of any shot blasting grit getting into the BB. Years ago I fell into this trap and completely ruined the bearing, fortunately it was only a humble TDC and I just went to the shop and bought a new one - I think the spindle cost 25p! Things are a bit different now.
If I were doing this build, I wouldn't worry too much a bout finding Chater cranks. Aside from the expense, I doubt whether Mr. Chater Lea himself (there was such a person) ever really approved of derailleur gears. As far as I can remember the only Chater double rings I have seen have been on the back of tandems, and they were quite frequently used for that purpose.
I have a feeling that the rings were only made with even numbers of teeth and if this is so it would mean you are stuck with a four tooth difference between the rings. If you look at a gear table you will see that a three tooth difference at the front gives a much better spacing of gears using a block like yours with two tooth differences.
If by any chance you have any Chater BB cups surplus to your requirements, I would be interested in buying a pair (or even just one).