I did a title search for "PC Case" and got 145 results. Many of which are full journals that are finished with great results.
At least try a couple searches before you ask. If you actually read through the threads involving PC Case grows, it will prevent you from having to ask the same questions every noobie grower asks.
It is possible? Yes
Is it easy? No
Will I get fat nugs? No
Will I get lots of bud? No
What strain should I use? Anything autoflower or go 12/12 from seed
What pots? 3L soda bottle on its side will grow 1-2 plants.
How much will I get? 4-15g dry per plant, depends on WAY too many variables.
What kind of light? CFLs, highest wattage that will fit, max 100w (not 100w equivalent)
Hopefully that will keep a few of the same old questions from being asked.
The only real advantage to doing a PC case grow (besides bragging rights for actually keeping a plant alive in one) is that PCs kinda hum and make noise. now if you lightproof the thing 100% (which is VERY fuckin hard and time consuming) then it will just look and sound like a PC.
Problem is that you have to LST the hell out of the plants, or use a screen and everything has to be done just right. For all the work, money and time put into it, you could have built a cab with a larger light to grow a few more plants. Or do what I did ant gut a mini fridge. Growing 1 plant is just as bad as 49 in most anti-pot states.
Anyone who is under the assumption that they can grow a plant in a PC case in order to hide it from their parents/roommates/wife etc. are sadly mistaken. Even if you are very careful and dont get caught lugging soil bags home, and watering, and hiding your nutes, pots, lights, etc. then the stink will still get you. You can have the best carbon filter and ozone generator money can buy, and the smell will still get out at times. Such as, every time you open the case to water, peek, prune, adjust.
So if you wanna grow bud in a small space, use a PC if you must. Just keep in mind most people getting good results from PC grows have a few grows under their belts to begin with. Using something twice the size of a PC will give you ten times the opportunity. Besides, who wants to put all that time and effort to MAYBE get an ounce of bud? I just put in the same amount of time on my closet grow and will walk away with about 8oz. Got 4.65oz out of my mini fridge grow. If the setups were dialed in I could have pulled twice as much out of each grow.
Best of luck
KB