DIY speakers of solid/reclaimed wood?

It wouldn't be my choice but I reminisce at the look of my road worn DYI birch plywood JBL 4530 scoops.

A close inspection of the underside of most every Viol table (spruce top) you'll find inlay patches holding the grain together. 100 degree heat is murder on old hide glues.

I finally sold my Pollmnn Busseto Double Bass because of the constant maintenance it required. The older it got the more it needed and I live on the centeral California coast. I'm down to the pre WWII Benedict Lang laminate and a recent Upton Bostonian.

Use a high quality water proof wood glue and screws were possible.

There are a few technics to prevent expansion cracks. The most probable  easiest is to rip the wood into stips,  maybe 4 to 5 inches wide and regluing them to fairly well match wood grain.  These small strips do not expand like something that is say 12 inches wide.  
There are other things that you can do,  it just takes a bit of know how. 

After googling around a bit I found out the daedalus speakers are not 100%solid wood,other materials are employed.The old wooden instruments had to have been carefully stored,maintained,and occasionally repaired.The secret to the pieces of wood used is the way it is slowly and completely dried then sealed completely.Darn,I actually had to think and learn something new today:)

Reclaimed lumber is actually a verygood  choice just liken making guitars .old lumber all the moisture and resins are dry and acoustically much tighter. Once your uusesevetal natural costs of a tongue oil , or something natural ,Not polyurethane allows the wood to breath . I prefer tongue oil in ships have been using for hundreds of years let each cost dry the finish not only is more durable ,but as a added benifit it breaths and is water resistant .
if you can get it in a natural finish you have a winner. My friend is a custom cabinet maker so I learned a lot obout the best applications.

I would think the biggest problem would be cost. Thick dense old growth walnut is very stable. Stable enough to be the preferred wood for gun stocks. But nice, dense tight walnut is insanely expensive.