Are you not in danger of starting the screw-it-together myth? The internet fills up with the effects of the torque used to tighten screws on tone? (It's probably happened already).
The next test is to see how the sound changes with different planks but cut from the same tree, before moving on to different planks from different trees of the same species grown in the same location, and finally different trees of the same species grown in different climactic conditions.
If you're inclined you could undertake that. For me my plank example was simply a thought experiment to demonstrate that wood has some effect on tone.
Once you have built up a data base of the variations all these tests produce, only then can we see if changing to a different species of wood makes a sonic difference that falls outside of this.
I'm not really looking at it as the species having a huge effect. It's the properties of the species. Wood for instruments is seasoned -- dried out -- so two planks of mahogany could have different properties and sound different.
Of course these test are only really meaningful if you are making lap steel guitars from a single piece of wood. Real-life solid guitar construction is far more complex and has far more variables.
A plank is a rough approximation of a through neck guitar.
My attitude to trying solid electric guitars is to view the instrument as a whole. Do I like the look/feel/playability/sound of the instrument? Yes or no? If yes consider buying, if no move on. There are so many instruments available these days with all sorts of combinations of materials and electronics its the only rational thing to do.
Can't disagree with that. Is choosing an instrument particularly rational though? I choose an instrument because I like it, and liking and disliking isn't rational.