I'm not a New Hudson expert, but there is a bit of universality (weird things excepted) about the levers and cables. Try:
Left inverted lever to the decompressor
Right inverted lever to the front brake
For the carburettor double lever:
Upper lever to the air slide (usually rear of carb)
Lower lever to the main throttle slide
If the magneto has variable advance and retard, the lever can go on the left bar.
I guess you don't have to worry about a clutch lever!
Hope this helps - looks almost ready to ride!
Leon