I'm curious. Why do you want the extended bump stops? Is it to help limit tire rubbing? It seems that retaining maximum suspension travel and doing trimming would make better sense.
I dont want to hi-jack this great build thread, so I will keep a response breif, we can debate the benefits of extended lenght bumps on another thread.
To respond, in my own little world, bumpstops play a certain role in a suspension system that:
1)Prevent over compression of the spring and dampener preventing damage and premature wear even preventing the coil from warping and becomming unseated in the strut assembly (an example of the bottom of a coil warping is in forum member "TheJosh" thread not sure this is the result of strut compression but it gets my point across and his build is somewhat amazing and fun to look at).
2)Help tune the up-travel of the suspension to the optimal length.
3)Helping maintain ride quality and vehicle flex by contolling the force of bottoming out the suspension at full compression (most aftermarket bumps use a better material than stockers).
To be sure I have no experience with ICONs strut setup, but in most cases just because you are adding 3 inches of lift through an adjustable coilover strut does not mean you are adding 3 inches of wheel travel in addition to the stock setup wheel travel, especially in an adjustable coilover strut like the ICON setup where the dampener travel needs to match the minimum and maximum travel setting. I have not seen the numbers on the ICON coilover strut full compression lenght, but it is probable that the full compression lenght is still longer than the factory Billstein full compression lenght. If the ICON strut, when fully compressed, is longer than the factory strut, when fully compressed, then the suspension will bottom out on the strut and not the bumpstop causing damage to the strut.
Other issues from over-cycling the suspension include contact with the sway bar, contact witht he CV shaft or boot, contact with the brake hose, etc..... these can all be prevented by properly tuning the suspension to the optimal compression lenght and using a bumpstop material that is designed to help dampen the bottoming of the suspension on full compression.
That's My $0.02 on why extended bumpstops are needed.
Happy to respectfully debate the issue more on another seperate thread.