I have a 36T with the (original?) Westerbeke 30HP vee drive. And yes it is possible to get excellent access to most parts of the engine, but it's a painful exercise in emptying everything out of the lazarettes, then putting it all back. A bit much to do for just a quick check on something. I don't know about others, but my lazarettes are full - I live aboard. But it's the only boat I've owned, and I love it for many reasons, including the interior, and it's sailing characteristics.
s/v Baja Beagle
"Time flies like an arrow, fruit flies like a banana." -Groucho Marx