Since the first outing a couple of years ago i've been pestered by the pair of them to build them a motor...
So, having gone through most of the older posts on here i've settled on a featherweight as being quite a good first choice.
Starting out with just a pair of crankcases, i set out to put together something entirely from spare parts, while still trying to remain true to the serial number on the crankcase.
3 years later, it's now finished

Won't win any beauty prizes, but it's tidy enough for what it will get used for.
And this is the end result
enjoy