Here is some info for the good of the oreder re: flamed redwood:
I only have 10 sets left. Priced at $150 each, shipped in the USA.
They are .170" thick.
Take a close look at the photo of the guitar I posted. The nature of that top wood is that it does have "wide grain" spacing...nowhere near the 20+ to the inch straight redwood I normally sell.
That said, it is still very stiff, though a final thickness would be in the range of .130" or better. The top you see here is .130", measured at the soundhole with finish. This guitar was built in 2000 for a client who has taken extremely good care of the instrument... stored in a case, humidified, not "on the road", etc. There is not a blemish on the top.
The guitar is currently in my shop, getting a new neck. The client was an "electric player" and used to thin necks. So, that's what he wanted 5 years ago. Maturity and aging fingers have led him to a bit more meaty neck, so we're doing a replacement.
If you decide to build with this material, do these things:
A larger bridgeplate to help spread the string stress...
Widen the base of your bracing...these are 3/8" wide, and 3/4" tall, nicely tapered toward the top of each brace and scalloped, but not radically.
Specify light gauge strings ONLY...
It will be a finger style instrument, no Tony Rice runs.
Don't thin below .130"
Make sure your client is acutely aware of proper instrument care and feeding. If you are building for personal use, you are already aware of these things.
I have built about a half dozen guitars with this wood...several OM (deep bodied), several 000-12 fret, a 000-13 fret with a 25.7 scale and a couple of Parlors. All are still in use, with no problems. But I followed my own advice on bracing/bridgeplate sizing.
The only problems...one guitar was dropped

and subsequently retopped with another flamed redwood top. One was used on the road throughout Europe, and suffered from the extremes in climatic change, stage abuse, etc. All the others, in private hands and care, have held up with no problems.
Hope that is of help to any and all considering building with this style redwood top. A final note: I have found very little of this type of wood that I would use on a top. The nature of it's beauty is it's greatest weakness...that flame is a very wildly oscillting "runout" in the grain, usually from the stump area of a VERY large redwood. The flame, as best I can determine, has developed from hundreds of years of the trees weight on that area of the wood, distorting the grain and forcing it into the flamed figure you see.
If I can be of any further assistance in answering your questions, post them here so everyone gets the "benefit" of my $.02!