parcel shelf

Hey guys, I sold my Astra but I have a few bits left over that I need rid of. C16SE engine - free to a good home - 99000 miles on the clock will need stripped and reconditioned (might do someone for parts), was mixing water and oil towards the end but not cooked as I was careful with it, was...

Right, so I couldn't sleep the other night so I started planning a home made stealth shelf for my 6x9s. Basically this is just a basic plan, and I wanted to know if there's anything wrong with it?? I've drawn up a few diagrams on trusty ol' paint! OK, so I have 2 boards of MDF. I cut...