About this 3D model

My attempt to make a cheap 3d printed Magpul XTM rail copy. Currently the model is very rough. I just did a boolean difference with an oval cylinder on mattroberts' G36 rail. http://www.thingiverse.com/thing:4757 I will work on the separation for the two ends and come up with a way from them to snap together as well. Texturing is last. Here is what I am trying to mimic: http://www.cgwgun.com/images/products/MAG410-FDE.gif