Yo Turbo, your rig is looking good. Glad to hear it is working out for you.
Regarding the "E"-Track thing I had the same delima. In my previous toy hauler I went through a lot of trouble mounting new anchor points using the "Sunk-in" loops (I think there were trap door latches), anyway once in place they were flush with floor but I spent a ton of time and effort to use a router to make the holes for the patches to fit, then custom made mounts for the tire hoops.
Anyway after all that effort to fit all the bikes just right, then my boys out grow their bikes and the bigger ones didn't fit the same. So this time I did the "E"-Track thing.
Only I took the easy route and just used some #12 sheet metal screws. That made mounting a breeze.
Also instead of mounting a front tire hoop now I use a tie down run between 2 tracks to hold the rear tire. It accomplishes 2 things that way, stops the bike from forward motion and holds the rear in place from side to side travel. Now I don't use a tire hoop in front. If I haul 3 bikes I put the middle one on the center e-track (with a small strap around the rear tire and back to the same point on the track and I have floor anchors a little further up in front for those tie downs.
All in all I like the e-track thing.