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Hi, this is how I masked up some pleco cave in clay. It was very easy to make, I bought some pieces of wood and some clay cave and only used the tools shown in the photos.
I am very satisfied with the result, it really just looks like natural wood and you can't see the clay cave inside. I really think I will build more like this.
I didn't like having clay cave in my aquarium, so I thought of this solution. I could do a similar job using the same rocks I used to set up this tank, but it's more involved, takes an angle grinder, and makes a lot of dust. Woodworking, on the other hand, is much simpler.

In addition to the clay caves, I built many caves and natural nooks and crannies out of rocks when setting up the tank, but now I thought I'd add some clay caves so the pleco can choose which one they like best.

result in the aquarium

Nice, look really good.

Very nice!

Here is my latest creation, this time I used rock instead of wood.
I went to collect rocks behind the house (as I had already done
when I set up my aquarium). To cut the pieces of rock I used an angle grinder that a friend kindly lent me.

Now they must become covered in algae and so they will become the same color as the other rocks in my tank.