Welcome newbie! Topic probably belongs in the case / modding area of the site, but...
This type of thing got talked about a LONG time ago when people started using peltiers. Never really took off for precisely the condensation problem. Remember peltiers needing rubber barriers around CPU to stop condensation giving other components trouble. Do remember seeing a waterproof motherboard on here a while back . that might fix the issue....
Also there are products using the principle anyway - for example
http://www.theinquirer.net/inquirer/news/1007088/thermaltake-pc-fridge