Sorry for the tardy response, been otherwise engaged....
Yes, a twixt the plates tank seems the way to go, I have recon something up like this:
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IMG20231104130814s.jpg
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Think I'll need to get some special tape to make sure it doesn't leak
It does vee down between the front of the gearbox and back of the crank case giving a shade over 4 pts whcih is close to what it says in the book.
After some soul searching and I decided to take the nulclear option for the magneto. I thouhgt about chasing about for another with the correct mountings, but what are the chances? eBay one might crop up tomorrow, or maybe not till the next millenium - you can't tell, and it could be a scrapper anyway. So, I re-tapped and plugged the original mounting holes which were a very very lose 5/16 BSW - so lose I looked for other sizes, but nothing realistic except maybe 9mm which does exist, but it jsut too weird to comtemplate. I then machined off 10mm to come down to the assigned 35mm mounting height and then re-tapped 1/4 BSW on a standard AMC mounting plan.
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IMG20231106184707s.jpg
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And it all starts to look a lot more sensible
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IMG20231106185636s.jpg
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