Mark did a number of renders for me as I waded through the spec process on my 570. I can't recommend him enough. If you're thinking of doing anything outside of what factory pictures will give you, having a render to visualize what your spec will actually look like is a huge benefit. It's also something that can be passed on to MSO, via your dealer, to help them better understand what you're asking for.
One more word of advice... Get in now before Mark realizes he could charge a fair amount more than he does for all the work he puts in!
“I had nothing to offer anybody except my own confusion.” ― Jack Kerouac