I'm with you and those pics do look great, just to call build quality completely covered is really a bit of a stretch at this point. We won't know for sure before a number of people have been using their production units for some time.
For example, 2 out of the 3 most common issues on the Tenores are caused by internal shortcomings that are invisible from outside.
What important is all the optimum eartips are included. Doesn't have to be SpinFit. SpinFit is just another eartips, not always optimum for every IEM. Optimum eartips sometime can be a very cheap generic eartips.
On my latest Titan 1 review, cheap generic triple flange and double flange sound better than SpinFit. Hopefully Trinity has done their due diligent to test all the 3 models with various eartips and includes the optimum ones.
Personally, I haven't found a pair of IEMs that sounds better with SpinFits. They increase warmth and decrease detail on everything I've tried, and from their design it's not hard to see why.