**Post your in Trunk Battery and Fuel Cell Pics**

Idaho said

That one looks fairly solid. God forbid any high speed crash but if it happens, the battery potentially becomes a very heavy missile - likely moving forward. I may do a cut-out in the floor to recess it a few inches. It would be far stronger than anything just bolted down.

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If you go with 3/8ths hold downs and fender washers or better under the floor , that battery isn't going anywhere.
If it does , you've got bigger problems than the incoming acid bath.
The bulk head you have installed ( you should if you haven't yet ) will save you some problems here too.
To the O.P. , I sumped my stock tank , but I'd look to put the cell further back to enhance traction if I was screwing your deal together.