There is nothing wrong with cutting wires and soldering and for fans you don't even need any soldiering. Although if you were to solder, speed of all those brus

There is nothing wrong with cutting wires and soldering and for fans you don't even need any soldiering. Although if you were to solder, speed of all those brushless dc fans can be easily controlled via voltage. Meaning that dc-dc step down converter (costs less than $1) is usually enough to make a fan quiet or just putting it on a 5v rail instead of 12v, although that might make it too slow to be usable. Also PC fans vendors suck, they overprice fans like crazy, sort of similar how expensive audio equipment is overpriced for audiophiles. Just use fans from a decent non-PC fans vendor, like Sunon. I wouldn't use rackmount cases at home though, they are not designed for low noise at all and fans are not the only problem. Noise from a bunch of vibrating HDDs is not as easily fixable as from fans, not in a rackmount case.