Box and Amp Layout Question

I have a couple of quick questions regarding the layout of subs and an amp in my trunk.  My trunk is only 40” wide where I want to mount everything – my 32” long box and 12” wide amp.  My current plan is to attach a piece of wood to my trunk floor and mount the amp in the very middle.  Then, I am going to add a second shelf above the first and put the speaker box (with 2 10” subs) on that top shelf.  This will accomplish everything I want – make the amp secure, leave future space for more amps and make the box itself easily removable.  I was even thinking of dressing up the lower shelf with some neon lights.  My questions are:

1)     If I build this shelf system, what is a safe distance to leave between the top of the amp and a second shelf?  Will this shelf restrict too much air flow, and if so, can I just mount a cooling fan to help out?

2)     With the subs sitting up on a 2^nd shelf, am I going to introduce a rattle of any kind?  Obviously, I will make sure that the 2^nd shelf is nice and sturdy, both it and the box will be carpeted and I was even thinking of attaching the box to the shelf with some brackets or something.  However, I’m worried that when the bass hits, it might vibrate too much.

I have a couple of quick questions regarding the layout of subs and an amp in my trunk.  My trunk is only 40” wide where I want to mount everything – my 32” long box and 12” wide amp.  My current plan is to attach a piece of wood to my trunk floor and mount the amp in the very middle.  Then, I am going to add a second shelf above the first and put the speaker box (with 2 10” subs) on that top shelf.  This will accomplish everything I want – make the amp secure, leave future space for more amps and make the box itself easily removable.  I was even thinking of dressing up the lower shelf with some neon lights.  My questions are:

1) If I build this shelf system, what is a safe distance to leave between the top of the amp and a second shelf?  Will this shelf restrict too much air flow, and if so, can I just mount a cooling fan to help out?

I'd say he would be fine with having it lifted off the floor of the trunk as long as it is sufficienty held down and such. It might affect the sound a bit but I don't have enough experience to say anything about that.

Concerning the air space, you shouldn't need too much, you have to consider, how much air flow goes through your trunk space currently? The ceiling height over it isn't going to need much really since there is no huge current of air flow moving through it. The only time that it'd matter is if you put fans pushing a lot of air for an amp that likes to get hot. I'd say you should be fine with a 2" clearance and if it is getting warm, fan it. :)