Chuck,
I've looked at your post over on doublegun and these pictures should answer one of your questions about the BT forend iron & latch.
The main difference in the two forend irons is the beavertail has the extra support rod/screw that runs down the rib channel. Look closely at the top view of the two together and you can see an extension of the beavertail iron for the thread boss that the support screw interfaces with.
I've seen several after market BT's that have been broken for the lack of the extra support.
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