I'm going to echo the warnings.
In my limited experience trying to buy things like IEMs and other items from AliExpress, often there are many questionable sellers, and shipping times are usually horrible.
If you are looking for a DIY kit, I would recommend starting with a proven source.
In the USA, Parts express, DIY Sound Group (if they are still around) and Madisound seem to be pretty solid and have kit options, with Parts Express probably being my pick for something relatively inexpensive, with good performance, that I can put together myself.
However, I must ask, why are you looking to do DIY? Aside from doing something special / exotic, DIY doesn't really make a ton of sense for "normal" speakers. Once you factor in your time for fabrication and design, you will often be better off buying a premade speaker...