I'll give you my humble opinion based on 25 years of restoring over 50 Mopars. I have done every kind of resto from basic, to resto mod, to OE Gold winners. 900 hours is getting into pro-territory, so I would expect some top shelf work with those hours.
One of the big problems I see is many shops just DO NOT know the ins & outs of Mopars, and it's a big learning curve for them. Our shop can do things that would take other shops twice as long just because of our experience.
At this point you need to decide if you want to ride it out or box it all and move on to a Mopar only shop. At this point in the game, they should be able to give you an idea the time needed to finish the job-but I bet they wont or can't because their lack of experience.
Resto work is a lot of work and very unforgiving-I'm glad I retired from it this year!
Good luck with you car!