when I ordered my Spirit the integration cable for FRSky was'nt available in the shop ("backorder"). As I think i have everything here (resitors, transistors etc) to build it on my own it would be fine if some schematic for it is available.
Forget about the Question if its more than 10 components, than its just not worth the effort. Even when shiping costs the same as the cable

Regards
Dirk_H