I actually started designing the hybrid circuits today--chrysler ign sw feeding ign-on power to rail 15 in the vw fuse box and such- theres a few circuits/items that need integrating-- chrysler sw with vw wiper motor--chr headlight sw with vw headlights--decided to not use the speed proportional steering valve on this system- I would possibly have to install the chry steer rack too, which shoots me in the ***, so forget it. turn signals use chry switches and relays with vw ext lights.
I draw out the systems from each book first, condensing them to one sheet with all the wire sizes and values. studying one for a while, until i understand how the juice flows and why. then finding equivalent wires in each system i can splice where needed. the horn system is designed. the hazard/ turn signal system is coming along.

A neighbor friend once told me " if you take care of the little things, the big things take care of themselves" he could scratch build a big block sprint car in a little over a month and paint it too. by himself.