Yeah, I didn'thave any fit issues either. regarding white or silver I like gloss white myself although flat will dry faster.

Regarding adding additional LEDs to those provided in the lighting kit you should be able to get away with a few. I myself added enough LEDs to merit going with a 12v wall adapter rated at 1 AMP (1000 milliamps). Each section of LED strip uses 20 Milliamps ( the LEDs are in series) while each LED in a parallel circuit takes 20 milliamps. So I'd recommend doing a count of strips and single LEDs to calculate your overall amperage requirements in order to determine if the kit power supply is sufficient or if you need to beef up the amperage of your power supply.