Jerry ...... thank you for your report on the IVA Fail. I obviously feel for you, particularly with regard to retest timescales and locations.
One of the reasons I'm thanking you is because hopefully others who are mid-build will read your post and realise that a fail can be achieved on very minor points. Insufficient bolt showing thru a nut is a classic. If it makes you feel better my car failed twice on real nit-picky points.
I'm concerned about your rear glass, particularly as you're going to a different test centre for the re-test. If it were me I would discuss this with them before travelling all the way to Exeter. The inspector would be correct to issue a fail for it not being correctly marked.
You are so close now, so keep your chin up and keep the updates coming.
Cheers
Steve.