I was thinking about extra bracing anyhow, since the bucket seats have the belts built in.
I also have an idea about hydraulic mounts vs. the oem cab shackles.
It's definitely a good idea to put extra bracing where you bolt through the floor with the seats, but this can also be accomplished with a piece of angle iron or a thick/large enough piece of flat iron. If you want to add extra supports under the floor for the seat to mount to you can do as much as you like.
