Absolutely! I have already stockpiled all the block, mortar, and rebar from different jobs that was no cost to me at all.That's always a plus to working in the trades, especially in rehab old work, so often so many used building materials can be had for free or very cheap by the boots doing the work. Good Find!
Where do you plan to put it? It sounds like it would hold up well as a free standing building outdoors, .