The inversions wouldn't be any differant than FOF. Look at MF's trains, it is almost impossible to get out of those. Look at Serial Thriller at Geauga Lake. The coaster cost ten million. The ride is always a walk on, except for Fright Fest and very RARE instances. Most of the reason for the low ridership is the head-banging. Some enthusisasts complain about people who complain about "rough" rides", but even they think SLC's are too rough. I think lap bars are possible and make the rides much more enjoyable.
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www.geocities.com/coasting_ohio for Real/Defunct/mini coasters and parks for RCT