John-I've got vague recollections of a mention somewhere of a Midge twin (ie the Mark Lubbock Midge 0.5/0.8 that appeared as a project in AMI around 1998)-if it exists he might be persuaded to publish the details which might might a good lead-in twin project before tackling something more ambitious. That being said I think CS still have the Oliver 2.5 cylinder assemblies available as spares.....

ChrisM
'ffkiwi'