Update
All went well at POE in Vegas. Just have your envelope, blue customs form and your passport ready at the visa page when you approach the border control desk. You no longer need the white I94 form (for the K1 process) that is handed out on the plane, it is all done electronically now.
I had no questions at the border control desk, just escorted through to secondary inspection were I waited for about 5 minutes then was given my passport back and a little leaflet that explains how to obtain your "I 94 Admission Number". Basically it's this online link
https://i94.cbp.dhs.gov/I94/request.html
Fill in the answers to the questions and you get your number back immediately.
Other than that, all good except for the car a/c broken and the house a/c broken yesterday (96 in the house ). It's fixed now though, phew. Next step.......... Married at the end of the month at a beauty spot next to the Missouri river.