Be sure any shroud you have made does not have any surface parallel the the rad core. A flat surface behind rhe core will create a static pressure zone and little to no air will flow at speed.
Realistically if you duplicate the factory shroud, fans, pulleys, radiator and waterpump you will not have any problems. If you want to keep your pusher fans for sitying in traffic go for it.
As for cooling your high stall trans, get an aux cooler with a dedicated fan
