You are about to build the Matrix Ctrlr. This is a Do-It-Yourself (DIY) Kit with through holes components and industrial quality stuff.
Building is a two tasks job : soldering and mechanical assembly. You should easily success in if you carefully follow instructions.
It consists in a sandwich made of the front panel and the PCB. Both are linked together with 11mm spacers and mechanical part sitting on the PCB that need to go through the front panel. This is where comes the subtlety of the assembly in the final steps.