I haven't built one but a friend had his intake elbow stolen from his Safari Snorkel. He went to an agricultural tractor salvage yard and got a screened "mushroom" looking cap appropriately sized to the tube and installed it. It was slotted on the mounting base so he was able to use a hose clamp. It didn't fit as tight as the original so he ran a bead of sensor safe rtv around the inside before slipping it over. It was a nice looking head and after a coat of semi gloss black it ended up being a nice looking job. Sourcing one of these heads and some larger exhaust tubing would make a nice looking home brew setup. IMHO, much better than the typical PVC abominations found at your local mud hole.
Ooops, after that last statement my "Glamper" is showing