Today I built a gate.
It's a fence panel but the only difference I could see is you got hinges etc with an actual gate panel, and it cost heaps more.
We are attaching it to wood posts and adding a spring wheel.
Husband helped a bit, mostly stood there telling me I was doing it wrong, I needed to do X first, Y wouldn't work etc.
But it was pretty much like those assemble yourself furnitures, except the bits just slot in.....Needed help to hit the post in at the end, to make it tight.
I love it, lighter than wood, easier to lift, don't know how long it will last really, but wood rots so baring concrete or stone, I think it's a good idea.