A little more progress. I got the patch put in where the floor was cut for a shifter and over the hole for the gas line. I'll be using a tank under the bed. The adhesive seems to have set up well. I used a little more from the underneath side to seal some gaps up. I think it will work great. I got a couple cans of undercoating that I'm going to try and spray on later, after the latest adhesive sets up. I was going to used the patch adhesive this time because it has a faster set up time, but no one had it in stock, so I ended up using the panel adhesive again. It's ok, just takes longer to set up.
I put bolts in all the seat mount holes and in the hump mount holes to keep the undercoating out of the nuts. The underside of the cab was already blasted and primered, so I should be all set for undercoat.