Thanks for sharing your setup Craig, it sounds like you've got things running the right way for your environment.
Given the new tools in v11/11.1, namely iFiles and sideband connections, coupled with tools that have always been there...there are several options for how to allow your LTM to host whatever web content you need, error pages or otherwise. That being said, if the situation dictates there is always the option to set things up like Craig has with a server that LTM routes to doing the serving.
Every deployment & org are different, and we're all about in making things easier, so the more options the merrier, often times. ;)
Colin
Nimbostratus