Couple things come to mind:
I'm a bit confused as to how you'd get just one set of quick disconnects would work for both blocks
If you wanna make a quick paint sketch or something to clarify that'd be cool
That drain port is for bigger tubing, check the danger den website lol. you may be better off with something like this, it also eliminates your need for a T
http://goo.gl/AyJIp
Next, I'm not quite sure of your work area/tool situation, but you could probably save quite a bit on tubing/reducers if you simply cut off the pre-existing barbs and tapped it with G1/4 threads. I'm sure someone on these forums could easily help you out with that
For power wise, if you can get decent flow with that tiny pump, remember how guy before just wired it up to usb? that would eliminate your need for a second psu
If it doesn't, theres gotta be some way you could (either off the laptop or the psu) splice a molex connecter in there somewhere
And yeah, that temp lcd would be cool