Such discussions have been held before, and both are on the to-do list. But as long as armor isn't implemented yet, there's no need for metal. But clothing and metal will definitely be implenented. We just need to be a little be patient.
The condtruction Methode hasn't changed much compared to the Java version, the keys have just been moved around a bit and it takes some getting used to at the beginning.
I always use the grid and I would not do without it.
My first priority is the grid, but I also use the magnet function.
If you have played the Java-version you should be able to cope with the unity version after a little time of getting used to it. ,😊