but why are there so few permit twins? ..... But even in the USA I can't think of many.
How about
:
Gweduck Aircraft - Home
or
Lockwood Aircraft - AirCam Price
But generally, there are few people with the inertia to build a multi engined aircraft. The practical need for feathering propellers dramatically drives up complexity and cost. By the time you can devote the effort to that task, you probably have lots of resources to just go and buy what you want. The CriCri is certainly an exception, as were the Lazair and CanAero Toucan.