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Thanks, they're still a bit shite but I can work on that....I've seen worse on bikes.
I remember reading that Jennings book when I was a kid (shortly before ruining my AR80 motor... :))
Gordon Blair at QUB did a load more work subsequently too.
I've a mate with a copy of this - https://vannik.co.za/EngMod2T.htm - so will use it once I'm ready to make a proper set. Lots of very detailed measurements required, so I need a motor to play with. Most are straightforward but calculating crankcase compression looks a bit fiddly!
Jung
As a retired teacher of metalwork etc., I am impressed - welding is (to me) very much a black art!
I'm guessing you've already found this:
http://www.vintagebikebuilder.com/jennings-two-stroke-handbook.html
page 51 et seq.