I have a new safe that I want to put out in the garage. I'd like for it to be in a specific corner, but that corner has a few quirks.
First, the slab is pretensioned. No cutting, drilling, coring, etc. All around the garage the concrete comes up about 6 inches, and drywall starts above that. In this particular corner the concrete juts out, making a sort of "L" shaped curb that sticks out about 4 inches. Here's a super-crude ascii-art isomorphic picture of what I mean. Yeah, it's a weird angle, but I can't describe it any better.
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What I was thinking of doing is pouring more concrete with a form to make an 18" x 24" x 6" pad that my safe can go on, but I know nothing about pouring concrete. Anything I need to know?