What is your experience in adapting other tripods or mounts to work with a Bren?

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Thanks Jim ,that is the Bren Gun tripod MKI I have , but I am missing the 2 light gauge steel tubes that store inside the right and left side frame tubes of the tripod . These tubes when joined together make up the third leg when the bipod is set up for AA usage . If I could see how they are made I will try to fabricate them . My tripod has the leg your Bren is attached to in your picture , which is the front leg of the MKI or the MKI* .