Plan how large of a fence you need and decide how many fence sections will be needed, these can be any width or height you want. Use a post-hole digger or an auger to dig holes for the 4x4 fence posts. A fence section will be created to fit between each pair of 4x4 posts.
Create the framework for each section from 2x4s, making sure to cut a groove with a router lengthwise on the inside of each board for the sheet metal to slide into. Screw the bottom and two side 2x4s together forming a “U” shape, then slide the sheet metal down into the framework and screw on the top 2x4 which will lock the metal in place.
Create the other half of the fence sections using galvanized conduit. Instead of creating a routered groove in the framework like the previous sections, figure out how many evenly spaced conduits you want top to bottom. Using a drill with an appropriately-sized spade bit, drill holes on the two side 2x4s to hold the conduit in place when the framework is together. Then simply screw together the framework, making sure to slide the conduit into place before the second side is installed.