Here's another one, from a slightly less anal angle.
These (BI or BII, not sure) machines (though tarted up) are in more original trim. The previous pic's example has a non-standard seat. Perhaps it was converted from a short-seat machine that had done gas-cylinder transport duty, which is their common working role. It also has a non-original half (assed) chain cover.

The other common manifestation of these machines is as the front half of a three-wheel light truck. Had some pics of those but I seem to have lost them when Yahoo briefcase shut down, though I thought I'd got them out. Bugger.