Well it's one of those "grey areas", isn't it? Initially I wouldn't have gone for Poplar as a tone wood because, usually, it is very cheap, and again usually isn't the greatest of the tone woods that are available.
But then you have to factor in certain conditions, don't you? A new blank, kiln dried and on the shelf in next to no time will have vastly different properties to the same kind of wood dried under different conditions for a much longer period of time. Natural ageing will have different effects on timber than a fast-drying solution. I know which option I would pick, given the opportunity. In fact, if given a choice of only two guitar bodies, one 30 year-old piece of Poplar, and one made of Alder that was felled a matter of months ago, I would go for the Poplar every time.
There are SO many variables after the fact of the age and type of wood in question, such as the luthier's ability to pair it with other species of timber and blend their properties to get "that" sound just right. The hardware he will pick for the project, whether he uses chambering or not, the type of construction used.
When all is said and done, building guitars is a true art, and you need to find yourself a true artist and trust in their experience and ability. Having a say in the process and being able to express your needs to the artist who will be crafting your guitar is paramount. It seems to me that the chap who built yours knew what you needed and let his experience speak for itself. Just a shame that all that effort seemed to have been ruined by shoddy wiring, but as you pointed out, that's a minor thing that can be fixed with a decent soldering kit and some time. :)
I'm glad you feel this way about your guitar, though. It must be really nice to pick up and instrument and instantly feel the quality and satisfaction as your perfect tone rings out from it. I am not quite there yet, myself, but very soon I will be finalising some details with a brilliant young artist who will be crafting me a custom guitar, and I can't wait! :D