I'm usually not active here and don't post here, but for this I am breaking my vow. :D
I'm very impressed by this engine. I have seen a few 3D engines on RMXP and they were ok, but nothing special. Anybody would have made them if they knew how 3D works. But this one doesn't lag at all which tops all of the other engines.
I'm curious, how much actual code do you have (KLOC)? Did you just wrap the dll's calls or have you added special functions and methods to support the dll's functionality further?
Apart from that I hope that you finish this soon and that you put together a good external map editor. I bet that many people would seriously consider this as alternative to other engines.

I wish you the best of luck!