The biggest benefit is that it makes running an oil burner much cleaner due to the higher combustion temp.
Bet in years to come all trucks will do this.
I always use YRM metal solutions as they are a good fitting panel and not over priced but for your bolt on I don’t think your going to get them off the shelf.
Give yrm a call they are very helpful.
The cheapest price above sounds quite high to me.
Find your local diesel man, he can check the injectors, set dry seat clean nozzles all for a few euros.
Your units can be striped and rebuilt by a 6year old, it’s the setting and testing which requires a bit of kit.
We keep our woofers in a trans k9 box which is very well made in steel, the Center devider is quite sturdy and you can lock the doors and leave the tailgate up so they don’t get too hot when left alone in the car.
What lights you got on the dash?
Can't think of anything brake abs associated under the drivers seat but there are a good few fuses to break.
Is the abs pump running.