In the above picture you can see several dry lower crankcase mating surfaces (40 hr) such as the mounting of the fuel injection pump (above the red emerg shut off switch). You can also see the oil pressure sensor switch, and the removable oil filter to the left of the drain bolt. During a test I ran the AC in 95 degree weather for about 2 hours and the crankcase oil temp was 165 F.
Behind this panel are two large mufflers. The exhaust note sounds like a large single cylinder motorcycle- a mellow thumper sound @3600 RPM.
I think the design looks more robust than my Yamaha- it all boils down to the execution of quality. I like the unit so much I may swap genuine Yanmar parts into the case if the Chinese parts prove unreliable.