I prefer a two sided (V) shaped box,
each side will give a slightly different tone, even if the sides are made alike....each side will have its own pitch... they can also be used as a locator call by imititing a gobble.
A one sided call would probably be easier to build and tune.
The biggest draw back to any wooden box call is they draw moisture.
even on the clear sunny days there is always a dew...which soaks into the wood.
I have had the best luck with oak...it just seems to draw less moisture.
but cedar,walnut, even poplar woods are good you just need to use a good water seal.
Let us know how it turns out!
TCB