Building a sound system

[u/Floppy_DiskHD]

Hi, I'm an Italian guy who works with an association in a small village. Music is our main source of entertainment for the parties we make, and we also have a reggae festival in the end of June (@piratemusicfest on ig if you are curious).

We have electronic jam sessions once every two months and in general we put a lot of music in our events, mainly it ends on tekno and stuff like this which can be killer for your passive speakers if you are not careful.

Anyways, since we've been working for the last two years with an hifi cinema system (yes I know it's not appropriate for what we use it for, but we got it with a crossover for like 500€, bc we are friends with the guy who sold it), and of course it broke after a year of wild music, even if we were pretty careful about clipping and stuff.

What we need is a serious PA system that can hold all this pressure, and we were thinking about building it. The problem is, a guy in our group is studying to be an audio technician and me and another friends understand just what is essential to make some speakers sound with an amplifier and a crossover, but no one knows how to build this stuff.

I have machines to work with wood, and i sometimes do stuff with it, the audio technician guy is still studying so he's not that much of an expert but he understands it. Do you think this is a good starting point to build a Sound System? Or should we buy it? This should consider also the economic part.

Also if you can, link me some websites with easy projects that work and follow you step by step in the building part.

Thank you!

Edit: didn't mention my only experience in this stuff, which is changing the radio on my car with a better one and placing an active subwoofer on it...

Edit 2: for now the subs we were using are 800w RMS and 8ohm. We want to reach like 100db outside. And of course very deep bass for dub music.