Sam, I hope I didn't insult you, and I truly hope you get a good sounding system. The forum members really care about audio quality and have a lot of experience. But, we don't agree on everything and have our own likes and dislikes. Some times we get a little snobbish if we think our best advise is being ignored.
If you are really wanting a stackable line array cabinet, I just came upon the DAS Artec 320 passive 2 X 10" line line array box. It is really an install box, but handles and a speakon connector could be easily added. It is flyable, but as I said it isn't supposed to be a touring box. It looks like it would be easy to stack, but find a way to do it safely.
I have not heard this cabinet, but I have heard a lot of other DAS line array boxes and have usually liked what I heard. The company is very international, so I suspect it would be available wherever you reside. I don't know the cost.
In my opinion, line array boxes always sound better when there are a lot of them (6 or more per array) and they are flown where the lowest boxes are way above the heads of the audience. Again just a personal opinion. I'm certain there may be other small wood passive line array cabs, but these are from a company known for line array systems.
Again, good luck with your quest.