The can itself is descent enough. There are have been a few users who have made mods to the inside for better results.
Also, the following thread
is good if you want something basic.
As far a mounting, you may have to get creative depending on what you have in your bay already. the brackets worked for to mount towards the front of the vehicle.
The only knock I had was the hoses that came with the system. After about 1 week of use (daily driven), they began to collapse a bit. I invested in SS air hoses for better support and better look as well. My next oil change is about 1month out, I will remove it and check to see what it may or may not be catching. I looked in the plenums prior to installation to see how much oil and what not was collecting in it directly, so this should give me a good idea.
I am by no means an expert but hope that helps. I agree with you, the ARC is cool but folks have been building their own for less than 20 with good results, soo?????