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@ the OP All part of the learning curve. The mistakes you make now you won't make again. And yes its expensive but if you stick with it then it'll payoff.
You can always sit the D5 on the midshelf or get a bay res that can house the D5, but thats more money again.
+1 it is the best place anyway on top of a soggy sandwich, to the op unlucky it can be a pain when you first start. One word of advice, stay away from compression fittings the first time you build get some 1/2" fatboy barbs and 7/16" id tubing can't go wrong, if your overly worried get some worm grips to go on the barbs.
. So some modding is required on that front. And I damaged the rad myself, and also didn't like the silver colour.
. Res may need to be moved when the board is put in, may not!
, tbh I worry that once you got it fitted with the luck you've had it will blow up your system, if me maybe go back to air cooling why you still got a system