Dick, what you propose is entirely possible for front brakes. Thinking back, the Mangusta chassis was originally designed for the F-5000 Sports racer, and my understanding is that chassis was taken virtually unaltered for use with the 2-seat Mangusta body.
Can you take any photos of the front-to-back tubes? I think the F-5000 had rear fender scoops that led to the rear discs; perhaps the long tubes served some other function.
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