Mud, of course an anvil can be made from what you are talking about but like thomas powers said earlier it will be like using an ASO from harbor freight instead of a good anvil. It seems from your posts that no matter what piece of steel you come up with you will look at it and say it is a shame to use that nice piece for this anvil, since I am building it it needs to be junk. Well if you do make an anvil out of the waste you have collected and glue it all together with something (resin, concrete, rebar, moosepucky etc....) you will have time invested and then think that you have to keep using it to justify the time spent no matter how poorly it performs. It will work good enough that you wont want to change it. Since you don't want to make a solid anvil you will never know its lack of performance. Use some real steel for the anvil and use the brake turnings to add mass to other parts of the hammer like filling all tubesteel pieces.
More priceless gems. :lol: