thanks all. this hotrodse isn't my final solution. i have 2 more hotrodse's and an arcadestick to mess with =) this first one is my guinea pig. trying this and that with it.
i haven't had any major problems with the trackball (plus its soooo much cheaper that happs). it took me some messing with the sensitivity settings in mame, but once it was figured out, centipede, millipede, etc. work great.
i like the idea of swapaxis, but with a little cutting and drilling in the dead center of the hotrodse, i can make it fit (and look nice) the right way.