I cut 11 Ga. aluminum plate to closely fit the shape of the rear engine tin. Then I used a '67-'74 Bug engine seal to close the gap. The aluminum is in three pieces to help with installation/removal. It overlaps the bottom of the 2" x 2" square tubing frame and is screwed into the frame with self-tapping screws. It has worked very well and is tight. https://www.jbugs.com/product/111-705D.html
Do you have any pics of the tin from under the engine?
i need to replace my tin, my mechanic removed the engine and destroyed the tin now the car is overheating and I can’t drive the car.
can you use stainless steel instead of aluminium?