For those In America looking for a ready made circular target:
https://www.amazon.com/dp/B001BQZ7AU/ref=cm_sw_r_cp_apa_glc_fabc_GZFGQ519JMY94XQ...Picked up 4 of the 19" version, but only because I'm impatient and didn't want to wait until May for the 18", which I Suspect would be better for improving accuracy for Balearic style competition training (20" pan is about $20 bucks; no gracias)
Plan to glue at least 2 together to reinforce the thin 18ga thickness of the metal, which should give me some good use; at least while using tennis balls. I suspect once I step up to rocks these pans are going to get obliterated.
Was going to check local thrift shops and discount stores to look for old circular pans, but because it's Hawaii is almost impossible to find something this cheap in ideal dimensions. May the target gods be ever in my favor with this new project