I came across a thread on another forum that has some interesting talk about a custom, aluminum diamond plate box for a Honda generator. I can see having someone weld up one of these for my rig. No need to take the generator out of the box to use it.
Also a link to another forum where there is a modified generator compartment to allow a Honda Generator to fit into it. How he handled the exhaust is interesting, it exits above the RV roof.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/20038531/srt/pa/pging/1/page/1