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I haven't seen the episode in question but as far as walkers for horses I was building horse walkers out of old truck or car rear ends over 50 years ago no cad needed just weld a support frame together to hold the rear end vertical pull the back cover off and weld the spider gears for a positive drive add an old 4 speed manual transmission put a 14" diameter pulley on the input shaft to a 2" pulley on a jack shaft with a 12" pulley on the other end drive that with a 1/3 to 1/2 Hp electric motor with a 2" pulley. Mount 4 to 6 20 ft long pipes on a wheel mounted on the top axle tie the reigns of a hackamore halter to the ends of the pipe to lead the horses. Put the transmission in low gear and switch on the motor. it would walk the horse at a nice leisurely pace to speed them up a little just change the gears High gear would be a fast trot but too fast for the 40 ft diameter of the merry go round.
A variation of this was to not weld the spider gears but to hook up a brake line to the brakes on the bottom axle bury the line and run it several feet outside the walking path then with a master cylinder you could control the amount of friction holding the drum disk brakes hadn't come out then the harder the brake peddle was mashed the faster the walker made the horses walk you didn't need the transmission but you did need another jack shaft to get the reduction gearing and the brakes would wear out about every 2 or 3 months of constant use One advantage of using the brakes was if you let all of the pressure off the horses could stop the walker while the motor was still running. you could add a 2nd master cylinder to operate the brakes in the top axle for emergency stop.
If they want to do a how it's made segment come talk to me I can build and show them how things could be and were made long before we had computers.
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