Nice score with the chunks of steel. Both should work quite well. I would work on a better method of mounting them though. The half round in particular is going to lose a lot of energy sitting on that piece of wood like that.
I've always used large stumps but anything solid will do.
For the slab, you could try a large bucket and pack sand around it. I did that with a piece of railroad track and it worked pretty well.
Block anvil and half round
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Nice score with the chunks of steel. Both should work quite well. I would work on a better method of mounting them though. The half round in particular is going to lose a lot of energy sitting on that piece of wood like that.
I've always used large stumps but anything solid will do.
For the slab, you could try a large bucket and pack sand around it. I did that with a piece of railroad track and it worked pretty well.