Looks good. How big is it? Also, how many salamanders are in there?
I would suggest adding a layer of chicken wire on the lid over the top of the mesh you already have on their. A animal could probably break through that mesh by the looks of it, so it wouldn't hurt to put some chicken wire in there for extra stability.
The folded carpet material is a great idea, it looks like there are lots of little hiding crevices for him.
I might also suggest adding a few more leaves on the ground, that way if he ever wants to go from one hide to the next he wont feel so exposed and out in the open when he does.
The water bowl looks quite nice, I have to say.
Thanks for sharing!