I can get some pics tomorrow of the the Spanish guns forend w/ejector bits.

Really the only addition an ejector forend would have over an extractor forend would be a "hook" that holds the butt end of the vee spring stationary. If one would be inclined they could weld on a block and machine it, or dovetail in a block and machine it. Everything else just involves removing metal and drilling some holes. If you're using pre-made ejector parts hole location is critical.

Im a fan of the Anson design. Not only does it provide better leverage in removing the forend, but one can fit the sliding lock so it will allow for wear. Doesn't take much wear on a deeley latch to make the forend loose. Still an easy fix...

The Spanish 20ga did sale. The customer is doing a .500 Linebaugh revolver cartridge on it. Big bore with a little case on a little action. Its a pretty low pressure round though and due to case size there is plenty of wall thickness around the chambers. Will yield a light rifle.