mounting amps

[07_ZX10 4]

i got my box built, needs finishing braces and covering. But, now i have no place for my amps. I have searched and read couple post that say it is ok, and some that say it is not. If I just double the sides of the box and mount my amps on the side, will they be ok? I have enough room if I mount my 1500d's end to end and then my 100.4 on the other side. I can mount them on my back seat, but the seat wont be able to fold up. Pic of where box sits now:

[KU40 173]

it is fine to do so. I have been running mine attached to my sub box for 3 years.

[RobClay 20]

nice box

[07_ZX10 4]

thanks guys