The kickstands were bolt on using I think one of of the engine bolts, at least that's the best way I found to mount mine.
The early cub/econocycles had just one set of slots in the motor plates, a single mount for the short seat, and the earliest turbines used a small bolt pattern for the sprocket.
The later rascals and choppers had a longer seat so there were 2 mounts, there is a tab on the back framerail to mount the long chainguard, and the motor plates had multiple slots. They also improved the wheels around 68 using the wide bolt pattern for the sprocket (they run true) which they used up till the end.
Mine is setup as more of an early econocycle, It was probably actually a kit frame though as there is no serial numbers, it still is the early version frame though.
they all used the odd metal side tanks like Rupp used in the Monza karts.