Beautiful flares, nevertheless if you wish to remove then I’ll recommend for you to sand the entire ¼ panel or were you believe that the flares is married to the original metal, once you get to the weld, it should be an easy removal from there, a grinder or a chisel, and take it to town. Nonetheless, as per the pictures, it looks like a well done job, perhaps all you need is some coilover to lower the Z just a bit and make the flares look functional and not so high. Good luck.
Alex