Building a sophisticated CMS using custom post types and custom fields

I am working a fairly sophisticated content management implementation using WordPress. A large part of the content functionality on the site is currently built upon custom posts types and associated custom fields.

I’ve extended the core functionality with a couple of plugins, the GD Custom Posts And Taxonomies Tools and Posts 2 Posts plugins for maintaining relationships between post types.

As part of my research to date, I also evaluated the current versions of the Pods CMS plugin as an option, and while I liked a lot about it, I’m wary enough of going down another rabbit hole of abstraction where the whole site relies on a CMS inside a plugin – so I have abandoned that as a solution for now.

What I’d basically like to do is set up various post types which are related to each other, and have a distinct set of custom fields associated with them. I’ll need admin editor screens for the custom fields as well.

The Custom Field Template plugin seems to offer this, but it seems a little clunky and limited on the display end.

Has anyone else done something like this? Any suggestions or recommendations?

Thanks,
John