If you do make a Bryce .obp version you might as well just make a .br4 file, either version will be able to use the model then. If you make it .br5 only Bryce 5 will be able to use it. BTW Poser figures can have minor adjustments made the same way, you just can't make big movements. (ie maybe the foot isn't pointing inquite the right direction or something similar). BTW the droids look nice and someone may buy them.