Gorgeous car, Wayne! What a great find.
As a former Marcos GT gullwing race car owner, I experienced similar issues. How do you safely lift a car with a thin, plywood monocoque chassis?
I only found 2 ways to do it; one is somewhat more risky:
Safe: jack under a metal suspension point (rear diff pumpkin, or under the front arm).
Riskier: use a Formula Ford race jack with a 12"x12" piece of plywood, just behind the front wheel opening at the corner where the wood floor pan meets the side of the car.
Pedals: The pedals in the Marcos GT1800 (also designed by the Adams Brothers) moved forward and backwards to accommodate tall/short drivers. I'm guessing the Adams used something similar on the Probe?
Getting in & out of the Probe - how do you do it?
I found getting in and out of the Marcos GT to be quite an interesting acrobatic maneuver. Luckily the roll cage's upper door bar provided a "Monkey Bar" leverage point to swing my feet up and then down into the driver's seat.
I can't imagine entering & exiting the Adams Probe... Wayne, you really should share how to do that in a video.
Best,
Andy