New to growing, need advice on PC Build.

Hey all ..
I think I'm done building my very first pc grow, and I'm excited!
I wanted to set it up and run it a few days to get a temp and humidity reading (right now I plan on putting it in my basement where the temp was around 66 and I believe the humidity was around 43%)

The pc box itself is standard size. Here are the details:

Lined with mylar (sunshade form my local dollar store)
one intake fan @ 12V and .25A. The power supply for this is 6V and 800mA (I think I may be in trouble here).
two outtake fans @ 12V and .25A each. The power supply for this one is 12V and 1A (I'm pretty sure I'm good here)
all the seems are sealed with aluminum tape
I have three 23W (100W equivalent, 1400 Lumens, 6500K) Daytime bulbs

I've got some pics, but before I start veging, I'm hoping I can get some sound advice on my build by some of the experts.

The seeds I'm planning on growing is Arjan #3 that I got from Greenhouse Seeds.

Here's some pics:

Attachment 291540 Attachment 291541 Attachment 291542

My big concern is where the exhaust fans are located, I have one on the back and one on the side. The one on the side is impacting where my lights go, and where is it right now, I'm afraid that it's way too high in the cabinet.
I want to be sure that I have good ventilation, and I'm afraid I overdid it.

Don't be afraid guys, shoot from the hip! I can take it.