I like where you are going with the extended tail on the BC to carry the TC actuator. I wonder if you will see flexing and cracking in the weld joints due to the stress in the arms extending back from the BC. You are definetly cutting edge. Nice work!
How long is the extension back from the original bolt carrier to support the TC actuator? I assume it would vary depending on where you locate the feed tray and hinge point for the RPD tray and TC.