You'd need to change the mesh itself, due to the new MTF facing the ground, and you'd need to change some code in the files so the animations are timed.
Well, I recently discovered (and by recently I mean today) the little tidbit that the new MTF model faces downwards on its face by using a program that can view .b3d models (but can't actually modify them), but I have no idea what lines of code I need to change and in which files the lines are, and how I would change the mesh. Probably isn't too easy to find tutorials on this type of thing either, considering that Blitz is no longer supported.
Unfortunately, what I have at the moment is probably the best I'm going to get, considering my complete lack of understanding when it comes to coding in Blitz 3D, and modifying .b3d files in general.
Thank you for the assistance regardless.