You can get pretty creative with installs but its an individuals ingenuity that makes thing work or not with hiding things or in making something look like it belongs versus looking like it was slapped or just added on as an afterthought.
If you want to hide things for instance, like the lines, you can install nylon sheathing over the lines and use heat shrink tubing. The same stuff is used by the OEM's on harnesses and hoses. The sky is the limit and most of what can be potentially be done is up to the user.
Kits as sold leave open many options of what can be done with some thinking. Most kit makers want pump and tank installed in the trunk to help protect the components. How you mount these to the body can be as fancy just simple bolting them down as is to the use of aluminum stock found at Lowes or Home Depot to make brackets to going with something like a setup from Howerton.
As a basic guide for background info, use plastic tanks, taller but yet have sufficient total volume is better then shorter and more squat. Have the pump inlet lower then the tank outlet supply fitting in the tank and try to avoid any sharp turns in the lines. Mount the tank so that its easy to fill and easy remove. Mount the pump so it has some room around it = do not pack it into a spot that causes problems with service or kinked lines.