fuel tank mounting

[BenBrooks]

to mount my fuel tank i was going to rivet a sheet of aluminium on the bottom of the rear tub, so i can mount the fuel pump/filter and anything else i might need there.

Could i sikaflex the fuel tank to an aluminium base which is then riveted and bonded to the chassis? would that pass iva?

if not i would have to bolt the straps through a box section meaning i would need crush tubes which sounds like a lot of hassle to me.

Ben