Intructions are not included with the item, but can be found online. Definitely need instructions to assemble. When fully assembled, this is a sturdy case. But if you need to "open" it up, you'll have to somewhat disassemble as there is not a removable lid. I was inititially sent the wrong item and contacted the seller. The correct item was resent right away. You can trust this seller.
Satisfied with the case, it feels thick and sturdy when put together yet heavy enough to stay put alright. Personally the Pi was bought as light and simple desktop / pda like device so the openings for extras were not tested but everything else was found accessible without any annoying tight ports or loose board. Matte finish is preferred normally but this crystal looks nice without being overdone.