Yes, I pulled a Sweeney Todd on a Peter Stone Arab, and I am not sorry. It's gruesome. You may want to avert your eyes.
Don't say I didn't warn you. Ha ha.
I haven't done alot of customizing, and what I have done has been super simple. My friend Tiffany Purdy has been blogging alot about it lately though, and she's had some really excellent tips, so feeling inspired, I thought I'd have a go at the above PS Arab. Once I'd...er...slit his throat and turned his head, I thought I might as well do something to fix his muzzle since it has always bothered me as being too wide and too big in general. I cut his head almost completely in half with a dremel cutting disk...
...trimmed a tiny bit of plastic off each side of the cut, and then bound the head back together with pink embroidery floss (it's a color I'm never otherwise going to use). Once the head halves were secured tightly, I filled in the gaps with two-part epoxy glue and Gapoxio and let it sit for a couple of days to dry. (Sorry the picture below is so awful. It was the only one I got, and I didn't realize I had accidentally goofed up the camera settings. Doh!)
I also cut the tail loose from the hock, heated it up (in boiling water because I am still that primitive) to move it out a bit, and then cut off and resculpted the end of the tail. I still need to finish filling in the neck and throatlatch and finesse the tail a bit more, but this guy is getting pretty close to being ready to paint. I haven't decided whether he'll be a purebred or a partbred color yet. I'm open to suggestions!