This one will look brand new when you are finished Paul. Well done! It already has little resemblance to the rusty pile of nuts and bolts that once sat on my trolley. I'm glad the engine looks like it's a goer too.
I am interested to see the Wico ignition plate. The little H. G. Palmer that I am currently restoring has a similar ignition system and is also Wico branded. Made in the good ol' US of A.
The same H. G. Palmer also has a Zenith carby, being AH914 (Mark B), fitted in parallel with the manifold and air filter.
I don't think I can help with your ignition system, as I only have a few Bosch ignition parts here for the Southern Cross KXD-2.