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all that you'd have to do is make the post holding the rail extended to the supports and it wouldn't be too hard to get cars just think of the seats the same (not upside down) but the wheels are on the opposite side and put the metal rail on the wood in between the wood...
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but if you think i'm on something.....uhh i got nothing cuz im not on anything.
You forgot one thing... its wood! Remember what happened the last time someone tried to make a wooden coaster go upside down? Wood is not made to work againse gravity. Steel is different, you can weld steel, wood, all you've got is bolts, screws, and nails. The supports on the loop of SOB had to be made out of steel because wood would not support it. How could you possibly build a wood structure strong enough to hold trains upside down.
A support that looks like this |"' made out of steel is a lot different than one made out of steel. Steel could hold a train, wood could barely hold itself.
did i dream this or did Son of Beast get stuck up-side down in its loop? and if i wasn't dreaming then wood is stronger than you believe it is because its track that it ran on in the loop was made of wood not steel and it held a train up more than once if i remember right.