Here is a bit of an update. I took my Coolermaster HAF X case apart last night. The toughest thing about taking the computer case apart for me was removing the top 200 mm fan. The mounts are very poorly designed from an access point of view. You can't get a phillips screwdriver on it (not even one of those L shaped screwdrivers), and there is not enough room to use a socket. I guess a small wrench would have worked, but I didn't have the right size, and ended up removing them with a small set of vice grips, which was kind of hard on the screw heads (but I am not reusing them, so it is all good).
The second toughest thing was trying to find one of the little springs that are part of Coolermaster's 5 1/4" quick release mechanism. I looked for an hour and a half before I found it. Be
very careful when removing these parts...
Anyway, during the tear down I noticed a few things of interest. I was under the impression that the two bottom hot swap bays were fixed, but that is not true. Based on what I have seen, it appears you can relocate this to any of the other bays, the only thing is you need to use them one above the other.
Another thing: The internal hard drive rack is a very sturdy piece, and it has two strong metal rods that reinforce it below where the top three hard drive caddy's mount. It appears possible to cut this rack just below the reinforcing rods, leaving a space just over 11 cm deep, which could be used quite easily to fit a 240 mm radiator and fans in the bottom of the case. The top part of the hard drive rack rivets to the 5 1/4" bay enclosure in four spots, so it is quite solidly mounted anyway. This seems to be a very reasonable way to fit a second radiator into this case without interfering with the 5 1/4" bay area.
In regards to the front panel modifications, it will be possible to keep the inner most "frame" of the front panel intact. That is good news, as it will allow me to continue using the stock 5 1/4" mesh plates and retaining mechanism. It will also make it easier to reuse the original I/O panel.