Well, I did get realtime gouraud working, but only with a header file. The important thing is XPDATA, which isn't explained in any of the English documents I have (only PDATA, which obviously does not do real time gouraud). Which requires face normals, which jo engine converter does not make (understandably). That makes your tools necessary, and thank you for that.
I did try to get the binary files working. I can get them to compile no issues, but the model loading routine clearly conflicts with jo engine. (Screen opens to a glitched screen reminiscent of loading the file, then fades to black, then ceases) I'd have to rebuild based on your system routines. Making the Z-Treme engine truly an engine of its own being incompatible with the core of Jo.
I suppose if I wanted to build an extensive project, I (or rather we) really needed those binary load-on-demand files. I'll spend some more time experimenting later on what exactly I will need to put in and take out for it to load properly.
Another thing about your binary files is that they seem to require textures to display. Do you intend on it working with texture-less / material-less models? Not too important, as one could just slap a material on everything and put a white texture on it. Haven't made a conclusion there yet, again, need to do more experiments.