I have installed the CSK cover and will share my findings, I have shared all this info with Craig as well so he is aware of any issues..
First of all it's a very nice kit and easy to modify the stock cover to install.
If you have not modified your stock cover with a secondary cover you can get the unmodified stock cover out through the front of the shock unless you have really jacked up the preload on your shocks, I have installed the KWI cover on mine and while the KWI cover is intended to go on with magnets and is removable I chose to bolt and silicone mine on, so it will no longer come out from the front.
Now to the CSK modified cover, I could not get it in from the back, there was not enough room between the OEM shock springs, I tried it with the KWI primary and the OEM primary and it simply will not fit, then I installed the Bandit H2 Springs which are 1\2" smaller in diameter than the OEM springs (Craig also tested this cover with his MTS springs which are also smaller diameter) and it will not go because it hits the primary bolt which sticks out 3\8" on the KWI setup (it should go fine with the OEM primary) if I remove the primary bolt it will clear the spring and go in from the back just fine.
So my conclusion, the reason I purchased this removable cover is because of the permanently attached secondary cover and no longer being able to get it in from the front, the CSK cover removed the bump in the cover over the primary but it will not go in from the back as intended as there in not enough clearance between the primary (KWI or Factory) and the OEM springs, if you replace your springs with smaller diameter aftermarket spring as Craig and I did the cover goes in with plenty of clearance from the back but does hit the KWI primary bolt which then needs removed to get the cover on and off.
I would be very interested to hear from anyone that has installed the CSK cover and is running factory shock springs if they have been able to get the cover in from the back.
Not a knock on the CSK cover (although it may not have been tested with OEM springs) I'm running the cover because it gives be quick access to the primary and even if I have to remove the primary bolt to get it on and off that's still easier than removing the upper shock bolt on the trail, Craig even offered to refund my purchase price but I'm satisfied with it as is.
Again if you are able to get the modified cover in from the back with the OEM springs let us know so I can see what I'm missing.