The throttle is kind of nice because its like cruise control when your looking for fish,yet fast enough to come to idle when you shoot. The rack and pinion can be had from Applied technologies. The only problem is you may have to buy more of the rack then needed but, i'm sure you could sell it to somebody else looking to build a fan. If you end up not liking the electric actuator it would be super simple to hook a cable to as well. The rack is a real good robust design, no cables,pulleys,chains or sprockets to deal with. And the stuff also turns super easy with a cable setup as 2 of my buddys have them.