I`m still building my kit, I have a little more than the basic kit. Some power tools and some hand tools. I will buy the specialist luthier tools, for now I will continue reading up, watching videos and asking advise from those that have the skills.
I wont be getting quite as many tools as you though but it must be an impressive sight nonetheless.
I might add that the old tools are only going to go up in value, whereas the luthier tools you might wish to buy will likely be dropping or staying put and always available.
Best keep an eye on something if you think not, but for all the rest, a lot of gimics are offered.
Before I found this forum, say a decade ago, I was considering buying much more of the stu mac stuff, and I have a toolbox with a lot of it at the folks which hasn't been opened in years!
Most of the things which were on my wish list are no longer on my radar, for instance a chisel can make up for a lot of things in that magazine.
Special kerf saws for the fret slots I thought were needed, lol !
A lot of these things become much simpler and surer when you have the basic skills and knowledge like a saw set for instance, that wee tool is about a tenner, and can set a saw so you're 24 thou or whatever it is, (been a while) will be a perfect match to the fretwire, rather than splashing out on a rebadged English saw which is same quality without the logo.
Much better having skills instead of being stu mac tooled up and none the wiser.
Likely I'm preaching to the converted, as you've found this place.
Just mentioning incase you might have a split decision on a box of tools with red tape, and a hefty customs bill, or some stuff which would likely serve you a whole lot better for the next while.
As with any plane the obvious things, hairline cracks in casting, chips around mouth, a thin sole is to be avoided, especially with a longer plane.
Daecent bit of life (full length) left in the cutter hopefully, and no damage to the handles is nice, but wouldn't be the deal breaker for me.
That plane would make for a nice tool for shooting with if its in good nick, should you have a calling for acoustics.