One thing I love about this game is the leeway it gives you to play your own way.Engineering guns and suits seems to require you to become a burglar and/or murderer. It's not in character for Quain. There is also more ship based play I'm busy doing with a Fleet Carrier purchase now possible once back in the bubble and things I plan to do with it.
I also have not found guides for suit and gun material collection that really help enough and I don't want to spend time figuring it out for myself - at least not now. I started playing just before Odyssey was released, so coming to the game late unless the 1984 version on the ZX Spectrum counts.
I avoided all combat for years, myself, but not because it would be out of character for my CMDR. I don't roleplay. My CMDR(s) are just vehicles for me to do what I find fun at the time -- there's no overarching storyline in my head.
Funny thing about Odyssey, though, it kind of forced me to come to grips with the (lousy) Crime and Punishment features of the game. I had never had notoriety prior to Odyssey, and didn't understand the mechanics of it all. However, now that I do understand things, I find that I can pick and choose whether to do "bad things" or not. I can easily avoid bounties and notoriety now, if I so choose, and always be the "good guy." But you have to know what you're doing in order to remain on the good side of the law, which I find rather strange. I admit I'm not a fan of how C&P works.
As for guides on mat collection, the UTUBERS seem to be all in the 'kill everything and rack up notoriety' camp. It's totally unnecessary, but I suppose it's more dramatic and gets more clicks.
My main guide was this one, which is not about mat collection but rather about the mechanics of missions, and how NPCs react to you, and how to be stealthy. The stealth in Odyssey is excellently implemented, as are the missions. I've had an enormous amount of fun doing them.
The Definitive Stealth Guide!
I finally got my first "Live Odyssey" video guide completed and it's now available to view on Youtube, complete with a brand new intro/outro and improved audio recording. Most of the transcript is available in the description of the video but I'll add the key points here. I'll be adding to this...
As long as you're having fun, you're playing correctly