Be sure to plug all the other remaining rotation adapter holes on your doubler for the coupling piece. I had that doubler and as soon as i put it in, it started leaking, i was told to put allen head bolts in the remaining holes. I put a little RVT on them and that solved my problem.
On the 203 side or 205 side?
Good looking tank system. Are you going to do a storage rack on top?
The rig is coming along slow and steady