Yea the bottom rad seems to be fine where it is. I was planning to do the case mod to remove the bottom HDD rack. But honestly I didn't really want to do it, I didnt really have the tools so would have to buy them and there just didnt seem to be any point as there was enough space where I have seated it (for a 120).
My CPU seems fine, I have it clocked at 4.8ghz. Although I havnt had the chance to do a proper superpi or intelburn test. That said I've been playing quite a few games on it and aida64 has never seen the temp go above 50c which I am happy with. Normally sits around 45c(ish) after a few hours of gameplay.
As for the res. I had no issues at all getting into the 800d. I didnt have to bend anything just take the frontplate off, which is removed by grabbing the bottom of the frontplate and just pull it towards you and up the whole plate comes off then making it much much easier. I also believe its the only way to take the blanking plates out too. Then slot it in place. Sort out all your tubing etc, then once your happy with it all stick the frontplate back on with the res in place.