I can have anodizing done for free, so don't worry about that. If you go through with this, I hope you keep it relatively thin like the original. If it's too bulky I guarantee I won't buy it. OEM plate is about 1/2" thick at the bolts. I think a billet plate of 1/2" thickness including the fins would look great with the bolts set into or at most flush with the fins. I think you'd be best off leaving it polished. Long story short, a copy of what Hawes did would look best.
Gotcha. I've noticed they have had a couple different looks from what I've seen, but the one on their website looks the best to me. I plan on keeping it thin, but didn't want it too thin with everything cut away for the fins and allow it to warp or bow when bolted.