you did ask for opinions, so don't be too quick to say negative feedback and take offense when people are just being honest with you and expressing their personal opinions.
I don't mind it. I know if it was my car i'd make it removeable. Undo a couple bolts and the whole thing kinda slides out some how. That way you can still have the best of both worlds. At least with it in you could hide the battery in there somewhere too... maybe an extra one for when the stereo cranks up for a while.
Oh, and what about a built in esky some where in there too? Then it would be the ultimate party machine
Loving the progress too! Its always a buzz to see this thread on the main page. Certainly has come a long way! keep up the good work