Hmmmm!
Sounds like overkill to me. Temperature and humidity can cause havok but wooden framing properly braced/crossed and fastened has little movement from expansion and contraction. Thats why I like the L-Girder type of construction in addition to it's versatility in layout design.
Couple of tips:
1. Purchase the lumber for your layout a couple of weeks before you actually start construction....who really does this?
Place it in the layout area flat on the floor so that it will become aclimated to the temperature and humidity where it will be used. Pick and choose your lumber when purchasing it. Don't just take what ever they hand you. Small knots aren't a problem but get pieces that are straight and uniform ( that's gettting hard to find)
2. Don't use treated lumber...it has a super high moisture content.
3. Nails are a pain and don't really hold that good for layout construction. Screw everything together. Drywall screws and a varible speed drill make this part go really fast, plus its easy to make adjustments if necessary.
4. The use of a level and a square is mandatory.
5. Measure twice and cut once!!!
BTW while at the building supply place the other day I saw some "lumber" that wasn't wood. Its a plastic or composite. Its used for building out door decks and comes in dimensional sizes. Anybody "fooled" with any of this stuff????