WAY too small. Even sealed would be horridly tight. First off, you can do way better than a 505, especially for the money. Besides the fact that it's a POS, and nothing works with it. (The BT module never works, nor does the HD radio tuner, satellite isn't too bad). It's not bad for the money, but you can get a Kenwood DNX8120 for a lot less than $1000, and get 5v preouts, a bad ass EQ, Parrot BT, and a slick ass interface, with way more control than the Alpine. Not to mention the video bypass on an Alpine take a button and a toggle switch, or a PAC TR-7. A Kenwood, you just jumper the P-Brake wire to ground, and voila. Type-R's seem to be all the rage around here, but you can get better for less money.
Keep in mind...
eBay goods = NO warranty. There is a LOT of fake audio gear out these days, especially of the higher end goods.