A modern diesel should not smell in its compartment. Any smells will be due to spilled fluids, leaking fluids or leaking
exhaust, which should be avoided (spills) or corrected (leaks). If an
engine smells, it is an indication of poor or sloppy
maintenance - more of an appraisal of its owner than its
engine compartment.
Don't judge engine placement by
charter boat experiences. These boats are often poorly maintained, and when
maintenance is done, it is a rushed job to get ready for the next
charter. Spills are common and
leaks ignored until they cause actual problems.
Heat should be mitigated by good
insulation and
exhaust blowers. A good engine compartment will be insulated enough that heat does not readily extend beyond it and a few minutes of blowers after shutdown will cool the compartment off.
The
Lagoon 410 is a decent sailing boat. My opinion is that it has better sailing performance than the 380. More so than could be contributed to the extra waterline length.
Mark