Scott made their own sets, including the table-top projection model. They were very low production, and in fact, I have never seen a direct-view version like yours! The 800BT, if I'm correct, had the same projection TV as the table model. I bet it's in Rider's... I Have a set of Rider's TV manuals, but they're not where I can lay my hands on them just now.
And as Phil says, Norm Braithwaite is the guru on E.H. Scott, since we lost Roy Burnett a few years back. I'd take anything Norm says as fact.
Charles
Here's a nerdly teenage picture of me in Norm's house in the late 80s, next to his 3-cabinet Scott FM Imperial...