It's been quite a while since the last update, mostly because a lot of my work has been on the backend side of things. While I expected that I'd get the main rendering code set up in a few days and I'd be able to post a few screenshots of the current test scenes running in-game fairly quickly, a few technical complications with XNA's stock shaders meant this was easier said than done.
As a result, I had to get a lot deeper into the engine's ontology than I expected to at this stage, just so I can sort through different parts of the scene and be able to get them rendering properly. In turn, that meant actually getting to work on the level-editing interface, which I decided to try and cobble together out of WinForms.
So good in-game shots still aren't quite there yet as I have plenty more interface still left to do, but we're getting there: