Turntable Constructiion

I thought I would post a question to the group here regarding turntable construction.
Bill Kazel, who owns the Como Roundhouse has purchased two side pieces which apparently at one time made into a railroad turntable. There were four sides, which were used as roof trusses in a Denver building. When they were recognized for what they were by Ed Gerlitz, they were removed to Georgetown for possible use on the Loop, but there was not room for them and they were donated to a local contractor.
According to Todd Hackett, the side members look to be almost identical to the turntable at Como until the early 1900's. Bill would like to install the turntable in the pit at Como, but he needs help with collecting information on the center bearing mechanism and end bearings. He plans to apply for grant money to fund the project.
Does anyone on this board have access to such information or have knowledge where Bill could look?
Thanks
Mike