if there is a way to put 2 subs in a 1997 f150 with the half back seat, I have the box with one and the idea I had was to remove the back seat and build a box to look like a seat that could hold the two subs but I want to know if there is an easier way first

 

I don't understand what a "half back seat" is but why don't you try searching first...

 

its the truck with three doors not the 4 full size doors

 

Seat lift + box.

Search, there are hundreds of threads on this already that have more information, links, ect.