I only used the tank top a few times and Purrkins was hopping as we have said all kitties are different it's hard not to compare recoveries some things are the same some are not. I didn't do a thing to the tank top as it worked as a sling the way it was - like they use for pups. It was what I had and I grabbed it and it worked for helping Purrkins in the box and staying upright without face planting! 

Also if you have anything bigger to try for the litter box that might get Pablo to put his bum in it all the way and not pee out the back just a thought. I had to switch our box after recovery back to our old box with modifications (cutting the box out in the front) The recovery box ended up being too small. I was thinking you might be ok for recovery but this is where Pablo shows you what's ok for him. Follow and listen to what he shows you and adjust the plan that's the best advice I can give.

I know Dawna told you she used pizza boxes, a lot of people have used boxes for recovery its whatever works, Obviously the cardboard won't last unless you can line it with something. They still work. If you have any Rubbermaid type totes those cut easy with a box cutter/x-acto knife. We used a Dremel tool with a cutting wheel on it to cut Purrkins litter box out. The litter box material is tough to cut that is the only thing we could use to get thru that plastic. Then we filed the edges smooth. Your Dad might have a Dremel to modify something to work. Just throwing ideas out if needed.

I hope you both had an uneventful night.