I can understand why the stress and upset is rising for those who need these modifications.
I know in the past (and present for that matter) when it gets to this stage of the proceedings, the sure fire way to turn up the stress is when the dialogue is falling on the wrong ears or in some cases deaf ears.
I get the feeling in this case that customers are being heard by the right people and those people are working hard to resolve the issues as thouroughly and as quickly as possible.
Keep calm and keep talking. I feel sure that everything will work out ok over time.
Spring isn't here yet so there's still time for getting the car sorted.
All the best,
N-M