The picture taken from the back of the car shows bulkheads that look identical to those of the T53 from which the car was originally built. The suspension pick up points and suspension bits also look like Cooper stuff with little change if any.
There is little doubt that much everything in between must have been changed, first by Roger P to widen the cockpit per 1963 hastily-modified SCCA regulations regarding the seats, then by Bruce to fit the (possibly) wider Olds engine. But this is not certain since the T53 top frame tubing were mounted rather low, so the Olds COULD fit with really little change, mainly the engine mount pick up points. The tubing showing in the pictures from the rear bulkhead appears to be straight to the cockpit, as was that of the original T53 frame, so was it indeed changed, and if so for what reason?
Years ago I had a long conversation with Roger P about the car and what had actually been done to it before being sold to John Mecom. He said that "they jigged the frame, cut the center off and built a dual seat cage in between but retained the two bottom tubes that linked the front to the back in an effort to keep some structural stiffness."
So why would Bruce need to change that?
Now, assuming that the tubing from rear bulkhead to front bulkhead was discarded by Bruce and given to these two fellows, what could be done with it since the whole identity of the car rests with the fellow in Venezuela?
I believe (but without evidence, just as speculation) that Bruce had little reason to do much more than adding tubing to provide more triangulation to provide greater stiffness for the increased torque. Also according to Tony Mantle, Bruce first ran the car unmodified and with the "other" 2.7 Climax Indy engine that he had inherited in 1961 and used at Riverside in his own Monaco.
And according to Tony, he then blew up the thing and the block was thrashed while the head survived somewhere. He "had seen it once".
Now when looking at the Venezualian remains, the bottom tubing looks now interrupted and going in a tangent... I also love the muffler on the right side, was the car driven on the road!?
Interesting questions that would have Jenks up late at night!