I've owned three Martin Custom Shop guitars. D-35 Custom, D-42 Custom, and my current OOO-18GE Custom.
The first two took six months to build, the last one nine months. Long waits but it was worth it!
I've sold on the D-35 and D-42. While they were incredibly beautiful guitars their tone was just so-so to MY ears. My OOO-18GE, on the other hand, rocks the house. Here's what I ordered on the OOO-18GE Custom:
* Deep Body option (adds 1/2" depth to the body. Makes it sound like a dreadnaught)
* Full gloss, Mod V neck with 1 11/16" nut
* 1935 sunburst
* No runout on top (this is not an option they offer, but I've always requested it anyway and they've always delivered)
All three of my customs were ordered through Jon and Sharon at
www.myfavoriteguitars.com
GREAT folks to work with. I doubt any dealer out there understands the various custom offerings from Martin as well as Jon. He knows what works and what doesn't. His prices can't be beat either.