The rtt set up fits the XJ nicely. Congrats on the camo score.
You may already know this,the expanded metal is a great tie down platform. Depending on the size of the metal you went with you might be able to slip ratchet strap hooks at any point on the deck. It has come in handy on numerous trips to the hardware store.
The only downside is that it will sing a little more then before at road speed.
...and if you ever cut the top off it makes for a great sun screen. Lol
The rust...good luck! Mine was stripped and redone because the rust water hitting my soft top. Lasted about one season here in Texas bouncing off the mesquite trees. Rattle can seems to be the way to go now for me.