Hmmmm may be replacing my fQ Res for this build.
One question though just because assumptions can come back to haunt you...
No Aluminum will ever be in contact with the coolant flow correct?
I assume that won't be an issue but...
In the case of your Mandrel kit. A change which I really would like to see is to the cutting jig. 2 holes countersunk into the tube channel would go a long way to stabilizing the jig and keeping cuts clean. I have the kit and the jigs are awesome. However the rest of the kit could be, well simply better. Not a fan of the benders rulers. My old eyes have a hard time picking out the correct marks. So I have shelved them, and simply line the correct mandrel for the bend with the fitting run I am working and that gives me a good understanding of where my bend needs to be. It is beneficial for short runs specifically. My MB outlet to CPU inlet was a real wench to work before I did that. Now that PPCs has the PETG in stock, I get to do it all over again. I guess what I would like to see in the future is the rules being aluminum instead of clear and a mid hash mark for the 5 increment. Also it does not take long to take the markings off one of these rules. Simply for no other reason than conserving time by keeping them connected with the connectors included and adjusting them. The wing nuts are an okay idea but I think a larger flat knob would be better. I realize that your intent was to keep the costs down for your customers while supplying them quality bending experience. But in my mind a "Pro Kit" should be just that. I love my kit, don't get me wrong, but I would gladly have paid more if the changes I've mentioned were already in the box.
I was so impressed with the quality of the mandrels, PPCS is gonna get me 4 more of the 360s and Monsoon will have at least one Representative(likely more lol) at PDXLan in November.
I will have White PETG hardline and Economy fittings in my build as well as a leetle surprise because the color fits my build.