Hi Gavin & Richard,
You are wrong regarding the Leopard 40 being a Simonis design - both the Leopard 40 and Leopard 46 are Morelli & Melvin designs. With both of them a person accesses the engine from the stern - the 40 has a 29 Yanmar and the 46 has a 54 Yanmar. However, the earlier production used Volvo engines which gave endless problems with fuel starvation.
Simonis designed the older 38', 42', 43' 45' and 47' Leopards, which had a greatly lower bridgedeck.
Only about 6 Leopard 40's have been produced with the "owners layout" (3 cabin) for the charter market, with the first being delivered from the middle of 2008. This means that it will be many years before they become available on the open market. However, there should be a number of privately owned Leopard 40's available or coming onto the market soon.
The Delivery Guy - Now retired after sailing over 400,000 nm