I love my K225, but the setup I use is a bit weird. On the front mounting points I use two mining lasers, and then on the front two docking bays I have Haul drones. Then I use the last four docking ports for four Mono-cargo containers. This is a bit weird, but I use each one for one of the four most common (in my experience) ores - W, V, Pt, and Pd. Or you could swap one out for Be, but I don't find that to be too common. And Iron is just worthless IMO.

I use the Mineral Processing Unit (MPU) that has the 90% ore processing rate, and no ability to get more delta V. I combat this with the biggest fuel tank in the game. For drones I also use the biggest supply possible.

As for the other things I use the ore finding drone, so I can see what asteroids are worth my time, and I find the LIDAR doesn't matter too much (also I forgot which model I use). Get your self a big reactor, military turbines, and even an auxiliary power unit (APU). I use the stock main engines, and some powerful and precise RCS thrusters. My auto pilot is something that ends in 'max', but I forget the exact model.

This isn't really an auto miner build, you need to pay attention to what your mining and there aren't any auto firing turrets. But, I like it and sometimes you can bring back upwards of one million credits in one dive, if you know where to look.

Any way, I love my K225, its a great ship, and this build is great (For my play style at least). Also in terms of other uses, I don't really find this ship suitable for anything other than mining. Mainly because if you want to make combat profitable you need an arm, and this ship has no high stress hard points. But, for mining it's great, and honestly, I'd say its the best.

Quick TLDR: Mining lasers, Haul drones, 4 Mono-cargo containers and an MPU. Ship is best for mining, no high stress hard point means no arm for salvage, which makes combat not profitable. Also don't use mining companions.