I don't remember what's on the relay, and it's a bit late for me to go look at either of them, but I can tell you the wires I know:
4 from the motor: 2 for open, 2 for close
4 limit wires: 1pr open limit, 1pr close limit
3 for light: 2 for switch and 1 for heater
3 for radio: red, black, blue (trig/com/pwr)
2 per light socket
Hot, neutral, and ground from mains,
Theres a 110vac to 24vac transformer
Electromagnetic relay
Thermal light delay
Two NO limit switches
One NO master power cut off (on OHD unit only)
Then there's a reversing switch on each.
On the Sears it's tied to a pulley that slides side to side and is tensioned by two screws to independently control up and down force.
On the Overhead Door, it's a switch on the rail that trips if the openers rails and head arc when the door hits something. This is set with a spring tightened by a wing nut.
I used to work for Overhead Door, so the opener end isn't a problem. I just am lost when it comes to making the electronics. I considered scavenging a control board off an opener in the local door company's trash pile (I've since moved from Houston, Texas to Seattle, Washington, so I'm lacking my connections for parts) and trying to bodge something together, but the boards I find all have custom connectors, and wiring harnesses that didn't match schematics I found online. Easiest thing for this is just make a controller, then I can adapt it to either machine. Also, if I can figure it out, it would give me room to customize the opener, or like Andy's suggestion, add safety sensors to a machine that is a truly reliable machine, just outdated.