I actually came up with a soup-to-nuts SAIM reporting content bundle which consisted of scripts on the IM to export via mongo, custom parser & transform, custom indexing and some sample reports if you'd be interested to use as a reference? I went ahead and attached it if you'd like a copy of it. It was developed by me for a client that decided not to use IM, so it's never been in prod, but it may still be a good jumping off point.
