I have 2 of these handle frames left from my last batch. These have a footprint that is the same width and length as the Wong handles. The three hole screw pattern is also the same, except that the rear screws are straight, instead of angled. I also drill the screw holes with a flat bottom countersink, instead of a typical countersink, so the plastic won't crack.
The trigger slot is 9/32" wide (vs. 1/4" for the Wong) so the handle will work with the standard Neptonics Reef and Tuna trigger mechs.
Bare frames are $55 shipped, and frames with a shapelock grip are $65.
This is my handle, with a Wong handle for comparison. You can see that the trigger guard on mine is rounded, and just a little deeper. This pic also shows the difference in the rear screws.
One guy wanted green and black, so I've been playing around a little with that, in addition to the standard black.