i am running stock 5 speed gear box, stock transfer gears, and stock 5.12:1 diff gears. the simex ETs next tot he 33" MT/Rs i had, had about a half inch difference in height overall. so they are about 32.5"-33".
i am desperately saving for some transfer gears, although i dont need them for the kind of wheeling i do.
i can sit on the hwy at 100km/h pretty comfortably, but normally, i sit on 90km/h to save fuel. i have been to about 140-150km/h on the hwy, down a slight hill and some tail wind, but extremely scary in my vit. (although, i don't have the standard carby on my motor)
as for open BL blocks, they are considered not safe here in aus, as a severe accident can see the bolts sheer, or tear out of the open block (RHS, or box tube), or collapse, and result in a suzuki escape pod being launched off a suzuki chassis. we have some pretty tough and strict engineering laws over here. and i was once told that a body should be held onto the chassis with a single bolt only at each mounting point, not 2 seperate bolts as the BOX BL has. so a calmini one shouldn't pass engineering here in aus.