OK here's a link to a calculator, put in your wheelbase, weight of what your going to move, and run it for each location (before move and after move) and then find the difference its usually lots less than you would expect.
If your not sure how it works try it with some simple numbers Beam Support Force Calculator
Everyone wants to know if it does wheelies, no it doesn't even try, It does pick up a inside front on hard acceleration corner exit but don't notice it while driving only see it in the pictures.
On the Vega I modified the trans for hard shifts 110 mph 2-3 would chirp the tires, after a while it broke the chain. So on the fiesta I left it stock and its been bullitproof.
There is a very very very remote possibility I may model the 3rd member and machine 1 or a few out of aluminum will let you know if I get serious as I said remote.
An opal is a nice looking small car should be fun!
What are these drive-trains going for these days less engine?