Kevin,
I went back and saw your measurements just now..
I checked the references in the shop but didn't find anything as helpful as the guys here have provided..
Another source for a large plane might be a high school or vocational school wood shop..
Re drying:
I saw a pretty good special on Japanese furniture crafting a year or two ago. They generally air dry but they will store wood for a very long time.. in the project in the special they were working with a piece that had been drying for 50 or eighty years... but that is for precision joinery with a focus on dimensional stability and perfect 90 degree angles..
If you have ever seen a peg fit chair leg get loose with age many time is is a function of the wood continuing to dry. Harder wood typically has smaller tubes (phlyem?) The smaller the tube the longer it takes to draw moisture out of it....as the wood dries it shrinks, but you probably know that
Good luck!
I look forward to photos of your project.
